Ancient Greek Ancient Greek (, ; ) includes the forms of the Greek language used in ancient Greece and the classical antiquity, ancient world from around 1500 BC to 300 BC. It is often roughly divided into the following periods: Mycenaean Greek (), Greek ...

existence Existence is the state of having being or reality in contrast to nonexistence and nonbeing. Existence is often contrasted with essence: the essence of an entity is its essential features or qualities, which can be understood even if one does ...

reason Reason is the capacity of consciously applying logic by drawing valid conclusions from new or existing information, with the aim of seeking the truth. It is associated with such characteristically human activities as philosophy, religion, scien ...

knowledge Knowledge is an Declarative knowledge, awareness of facts, a Knowledge by acquaintance, familiarity with individuals and situations, or a Procedural knowledge, practical skill. Knowledge of facts, also called propositional knowledge, is oft ...

mind The mind is that which thinks, feels, perceives, imagines, remembers, and wills. It covers the totality of mental phenomena, including both conscious processes, through which an individual is aware of external and internal circumstances ...

language Language is a structured system of communication that consists of grammar and vocabulary. It is the primary means by which humans convey meaning, both in spoken and signed language, signed forms, and may also be conveyed through writing syste ...

science Science is a systematic discipline that builds and organises knowledge in the form of testable hypotheses and predictions about the universe. Modern science is typically divided into twoor threemajor branches: the natural sciences, which stu ...

physics Physics is the scientific study of matter, its Elementary particle, fundamental constituents, its motion and behavior through space and time, and the related entities of energy and force. "Physical science is that department of knowledge whi ...

psychology Psychology is the scientific study of mind and behavior. Its subject matter includes the behavior of humans and nonhumans, both consciousness, conscious and Unconscious mind, unconscious phenomena, and mental processes such as thoughts, feel ...

history of philosophy The history of philosophy is the systematic study of the development of philosophical thought. It focuses on philosophy as rational inquiry based on argumentation, but some theorists also include myth, religious traditions, and proverbial lor ...

Western Western may refer to: Places *Western, Nebraska, a village in the US *Western, New York, a town in the US *Western Creek, Tasmania, a locality in Australia *Western Junction, Tasmania, a locality in Australia *Western world, countries that id ...

Chinese philosophy Chinese philosophy (Simplified Chinese characters, simplified Chinese: 中国哲学; Traditional Chinese characters, traditional Chinese: 中國哲學) refers to the philosophical traditions that originated and developed within the historical ...

Ancient Greece Ancient Greece () was a northeastern Mediterranean civilization, existing from the Greek Dark Ages of the 12th–9th centuries BC to the end of classical antiquity (), that comprised a loose collection of culturally and linguistically r ...

revelation Revelation, or divine revelation, is the disclosing of some form of Religious views on truth, truth or Knowledge#Religion, knowledge through communication with a deity (god) or other supernatural entity or entities in the view of religion and t ...

self-cultivation Self-cultivation or personal cultivation () is the development of one's mind or capacities through one's own efforts. Self-cultivation is the cultivation, integration, and coordination of mind and body. Although self-cultivation may be practice ...

epistemology Epistemology is the branch of philosophy that examines the nature, origin, and limits of knowledge. Also called "the theory of knowledge", it explores different types of knowledge, such as propositional knowledge about facts, practical knowle ...

ethics Ethics is the philosophy, philosophical study of Morality, moral phenomena. Also called moral philosophy, it investigates Normativity, normative questions about what people ought to do or which behavior is morally right. Its main branches inclu ...

logic Logic is the study of correct reasoning. It includes both formal and informal logic. Formal logic is the study of deductively valid inferences or logical truths. It examines how conclusions follow from premises based on the structure o ...

metaphysics Metaphysics is the branch of philosophy that examines the basic structure of reality. It is traditionally seen as the study of mind-independent features of the world, but some theorists view it as an inquiry into the conceptual framework of ...

argument An argument is a series of sentences, statements, or propositions some of which are called premises and one is the conclusion. The purpose of an argument is to give reasons for one's conclusion via justification, explanation, and/or persu ...

reality Reality is the sum or aggregate of everything in existence; everything that is not imagination, imaginary. Different Culture, cultures and Academic discipline, academic disciplines conceptualize it in various ways. Philosophical questions abo ...

properties Property is the ownership of land, resources, improvements or other tangible objects, or intellectual property. Property may also refer to: Philosophy and science * Property (philosophy), in philosophy and logic, an abstraction characterizing an ...

aesthetics Aesthetics (also spelled esthetics) is the branch of philosophy concerned with the nature of beauty and taste (sociology), taste, which in a broad sense incorporates the philosophy of art.Slater, B. H.Aesthetics ''Internet Encyclopedia of Ph ...

philosophy of language Philosophy of language refers to the philosophical study of the nature of language. It investigates the relationship between language, language users, and the world. Investigations may include inquiry into the nature of Meaning (philosophy), me ...

philosophy of mind Philosophy of mind is a branch of philosophy that deals with the nature of the mind and its relation to the Body (biology), body and the Reality, external world. The mind–body problem is a paradigmatic issue in philosophy of mind, although a ...

philosophy of religion Philosophy of religion is "the philosophical examination of the central themes and concepts involved in religious traditions". Philosophical discussions on such topics date from ancient times, and appear in the earliest known Text (literary theo ...

philosophy of science Philosophy of science is the branch of philosophy concerned with the foundations, methods, and implications of science. Amongst its central questions are the difference between science and non-science, the reliability of scientific theories, ...

philosophy of mathematics Philosophy of mathematics is the branch of philosophy that deals with the nature of mathematics and its relationship to other areas of philosophy, particularly epistemology and metaphysics. Central questions posed include whether or not mathem ...

philosophy of history Philosophy of history is the philosophy, philosophical study of history and its academic discipline, discipline. The term was coined by the French philosopher Voltaire. In contemporary philosophy a distinction has developed between the ''specul ...

political philosophy Political philosophy studies the theoretical and conceptual foundations of politics. It examines the nature, scope, and Political legitimacy, legitimacy of political institutions, such as State (polity), states. This field investigates different ...

schools of philosophy List of philosophies, schools of thought and philosophical movements. A Absurdism – Academic skepticism – Accelerationism - Achintya Bheda Abheda – Action, philosophy of – Actual idealism – Actualism – Advaita Vedanta ...

common sense Common sense () is "knowledge, judgement, and taste which is more or less universal and which is held more or less without reflection or argument". As such, it is often considered to represent the basic level of sound practical judgement or know ...

intuition Intuition is the ability to acquire knowledge without recourse to conscious reasoning or needing an explanation. Different fields use the word "intuition" in very different ways, including but not limited to: direct access to unconscious knowledg ...

thought experiments A thought experiment is an imaginary scenario that is meant to elucidate or test an argument or theory. It is often an experiment that would be hard, impossible, or unethical to actually perform. It can also be an abstract hypothetical that is ...

ordinary language Ordinary language philosophy (OLP) is a philosophical methodology that sees traditional philosophical problems as rooted in misunderstandings philosophers develop by distorting or forgetting how words are ordinarily used to convey meaning in ...

mathematics Mathematics is a field of study that discovers and organizes methods, Mathematical theory, theories and theorems that are developed and Mathematical proof, proved for the needs of empirical sciences and mathematics itself. There are many ar ...

business Business is the practice of making one's living or making money by producing or Trade, buying and selling Product (business), products (such as goods and Service (economics), services). It is also "any activity or enterprise entered into for ...

law Law is a set of rules that are created and are enforceable by social or governmental institutions to regulate behavior, with its precise definition a matter of longstanding debate. It has been variously described as a science and as the ar ...

journalism Journalism is the production and distribution of reports on the interaction of events, facts, ideas, and people that are the "news of the day" and that informs society to at least some degree of accuracy. The word, a noun, applies to the journ ...

interdisciplinary Interdisciplinarity or interdisciplinary studies involves the combination of multiple academic disciplines into one activity (e.g., a research project). It draws knowledge from several fields such as sociology, anthropology, psychology, economi ...

Ancient Greek Ancient Greek (, ; ) includes the forms of the Greek language used in ancient Greece and the classical antiquity, ancient world from around 1500 BC to 300 BC. It is often roughly divided into the following periods: Mycenaean Greek (), Greek ...

pre-Socratic Pre-Socratic philosophy, also known as early Greek philosophy, is ancient Greek philosophy before Socrates. Pre-Socratic philosophers were mostly interested in cosmology, the beginning and the substance of the universe, but the inquiries of the ...

Pythagoras Pythagoras of Samos (; BC) was an ancient Ionian Greek philosopher, polymath, and the eponymous founder of Pythagoreanism. His political and religious teachings were well known in Magna Graecia and influenced the philosophies of P ...

Old French Old French (, , ; ) was the language spoken in most of the northern half of France approximately between the late 8th Anglo-Norman starting around 1175 CE. The French is itself a borrowing from the Latin . The term ''philosophy'' acquired the meanings of "advanced study of the speculative subjects (

logic Logic is the study of correct reasoning. It includes both formal and informal logic. Formal logic is the study of deductively valid inferences or logical truths. It examines how conclusions follow from premises based on the structure o ...

,

ethics Ethics is the philosophy, philosophical study of Morality, moral phenomena. Also called moral philosophy, it investigates Normativity, normative questions about what people ought to do or which behavior is morally right. Its main branches inclu ...

,

physics Physics is the scientific study of matter, its Elementary particle, fundamental constituents, its motion and behavior through space and time, and the related entities of energy and force. "Physical science is that department of knowledge whi ...

, and

metaphysics Metaphysics is the branch of philosophy that examines the basic structure of reality. It is traditionally seen as the study of mind-independent features of the world, but some theorists view it as an inquiry into the conceptual framework of ...

)", "deep wisdom consisting of love of truth and virtuous living", "profound learning as transmitted by the ancient writers", and "the study of the fundamental nature of

knowledge Knowledge is an Declarative knowledge, awareness of facts, a Knowledge by acquaintance, familiarity with individuals and situations, or a Procedural knowledge, practical skill. Knowledge of facts, also called propositional knowledge, is oft ...

,

reality Reality is the sum or aggregate of everything in existence; everything that is not imagination, imaginary. Different Culture, cultures and Academic discipline, academic disciplines conceptualize it in various ways. Philosophical questions abo ...

, and

existence Existence is the state of having being or reality in contrast to nonexistence and nonbeing. Existence is often contrasted with essence: the essence of an entity is its essential features or qualities, which can be understood even if one does ...

, and the basic limits of human understanding". Before the modern age, the term ''philosophy'' was used in a wide sense. It included most forms of rational inquiry, such as the individual sciences, as its subdisciplines. For instance, natural philosophy was a major branch of philosophy. This branch of philosophy encompassed a wide range of fields, including disciplines like physics,

chemistry Chemistry is the scientific study of the properties and behavior of matter. It is a physical science within the natural sciences that studies the chemical elements that make up matter and chemical compound, compounds made of atoms, molecules a ...

, and

biology Biology is the scientific study of life and living organisms. It is a broad natural science that encompasses a wide range of fields and unifying principles that explain the structure, function, growth, History of life, origin, evolution, and ...

. An example of this usage is the 1687 book ''

Philosophiæ Naturalis Principia Mathematica (English: ''The Mathematical Principles of Natural Philosophy''), often referred to as simply the (), is a book by Isaac Newton that expounds Newton's laws of motion and his law of universal gravitation. The ''Principia'' is written in Lati ...

'' by

Isaac Newton Sir Isaac Newton () was an English polymath active as a mathematician, physicist, astronomer, alchemist, theologian, and author. Newton was a key figure in the Scientific Revolution and the Age of Enlightenment, Enlightenment that followed ...

. This book referred to natural philosophy in its title, but it is today considered a book of physics. The meaning of ''philosophy'' changed toward the end of the modern period when it acquired the more narrow meaning common today. In this new sense, the term is mainly associated with disciplines like metaphysics, epistemology, and ethics. Among other topics, it covers the rational study of reality, knowledge, and values. It is distinguished from other disciplines of rational inquiry such as the empirical sciences and

mathematics Mathematics is a field of study that discovers and organizes methods, Mathematical theory, theories and theorems that are developed and Mathematical proof, proved for the needs of empirical sciences and mathematics itself. There are many ar ...

.

Conceptions of philosophy

General conception

The practice of philosophy is characterized by several general features: it is a form of rational inquiry, it aims to be systematic, and it tends to critically reflect on its own methods and presuppositions. It requires attentively thinking long and carefully about the provocative, vexing, and enduring problems central to the human condition. The philosophical pursuit of wisdom involves asking general and fundamental questions. It often does not result in straightforward answers but may help a person to better understand the topic, examine their life, dispel confusion, and overcome prejudices and self-deceptive ideas associated with common sense. For example,

Socrates Socrates (; ; – 399 BC) was a Ancient Greek philosophy, Greek philosopher from Classical Athens, Athens who is credited as the founder of Western philosophy and as among the first moral philosophers of the Ethics, ethical tradition ...

stated that "

the unexamined life is not worth living "The unexamined life is not worth living" is a famous dictum supposedly uttered by Socrates at his trial for impiety and corrupting youth, for which he was subsequently sentenced to death. The dictum is recorded in Plato's ''Apology'' (38a5–6 ...

" to highlight the role of philosophical inquiry in understanding one's own existence. And according to

Bertrand Russell Bertrand Arthur William Russell, 3rd Earl Russell, (18 May 1872 – 2 February 1970) was a British philosopher, logician, mathematician, and public intellectual. He had influence on mathematics, logic, set theory, and various areas of analytic ...

, "the man who has no tincture of philosophy goes through life imprisoned in the prejudices derived from common sense, from the habitual beliefs of his age or his nation, and from convictions which have grown up in his mind without the cooperation or consent of his deliberate reason."

Academic definitions

Attempts to provide more precise definitions of philosophy are controversial and are studied in

metaphilosophy Metaphilosophy, sometimes called the philosophy of philosophy, is "the investigation of the nature of philosophy". Its subject matter includes the aims of philosophy, the boundaries of philosophy, and its methods. Thus, while philosophy character ...

. Some approaches argue that there is a set of essential features shared by all parts of philosophy. Others see only weaker family resemblances or contend that it is merely an empty blanket term. Precise definitions are often only accepted by theorists belonging to a certain

philosophical movement List of philosophies, schools of thought and philosophical movements. A Absurdism – Academic skepticism – Accelerationism - Achintya Bheda Abheda – Action, philosophy of – Actual idealism – Actualism – Advaita Vedanta ...

and are revisionistic according to Søren Overgaard et al. in that many presumed parts of philosophy would not deserve the title "philosophy" if they were true. Some definitions characterize philosophy in relation to its method, like pure reasoning. Others focus on its topic, for example, as the study of the biggest patterns of the world as a whole or as the attempt to answer the big questions. Such an approach is pursued by

Immanuel Kant Immanuel Kant (born Emanuel Kant; 22 April 1724 – 12 February 1804) was a German Philosophy, philosopher and one of the central Age of Enlightenment, Enlightenment thinkers. Born in Königsberg, Kant's comprehensive and systematic works ...

, who holds that the task of philosophy is united by four questions: "What can I know?"; "What should I do?"; "What may I hope?"; and "What is the human being?" Both approaches have the problem that they are usually either too wide, by including non-philosophical disciplines, or too narrow, by excluding some philosophical sub-disciplines. Many definitions of philosophy emphasize its intimate relation to science. In this sense, philosophy is sometimes understood as a proper science in its own right. According to some naturalistic philosophers, such as W. V. O. Quine, philosophy is an empirical yet abstract science that is concerned with wide-ranging empirical patterns instead of particular observations. Science-based definitions usually face the problem of explaining why philosophy in its long history has not progressed to the same extent or in the same way as the sciences. This problem is avoided by seeing philosophy as an immature or provisional science whose subdisciplines cease to be philosophy once they have fully developed. In this sense, philosophy is sometimes described as "the midwife of the sciences". Other definitions focus on the contrast between science and philosophy. A common theme among many such conceptions is that philosophy is concerned with meaning,

understanding Understanding is a cognitive process related to an abstract or physical object, such as a person, situation, or message whereby one is able to use concepts to model that object. Understanding is a relation between the knower and an object of u ...

, or the clarification of language. According to one view, philosophy is conceptual analysis, which involves finding the

necessary and sufficient conditions In logic and mathematics, necessity and sufficiency are terms used to describe a conditional or implicational relationship between two statements. For example, in the conditional statement: "If then ", is necessary for , because the truth of ...

for the application of concepts. Another definition characterizes philosophy as ''

thinking In their most common sense, the terms thought and thinking refer to cognitive processes that can happen independently of sensory stimulation. Their most paradigmatic forms are judging, reasoning, concept formation, problem solving, and delibe ...

about thinking'' to emphasize its self-critical, reflective nature. A further approach presents philosophy as a

linguistic Linguistics is the scientific study of language. The areas of linguistic analysis are syntax (rules governing the structure of sentences), semantics (meaning), Morphology (linguistics), morphology (structure of words), phonetics (speech sounds ...

therapy. According to

Ludwig Wittgenstein Ludwig Josef Johann Wittgenstein ( ; ; 26 April 1889 – 29 April 1951) was an Austrian philosopher who worked primarily in logic, the philosophy of mathematics, the philosophy of mind, and the philosophy of language. From 1929 to 1947, Witt ...

, for instance, philosophy aims at dispelling misunderstandings to which humans are susceptible due to the confusing structure of

ordinary language Ordinary language philosophy (OLP) is a philosophical methodology that sees traditional philosophical problems as rooted in misunderstandings philosophers develop by distorting or forgetting how words are ordinarily used to convey meaning in ...

.

Phenomenologists Phenomenology may refer to: Art * Phenomenology (architecture), based on the experience of building materials and their sensory properties Philosophy * Phenomenology (Peirce), a branch of philosophy according to Charles Sanders Peirce (183 ...

, such as

Edmund Husserl Edmund Gustav Albrecht Husserl (; 8 April 1859 – 27 April 1938) was an Austrian-German philosopher and mathematician who established the school of Phenomenology (philosophy), phenomenology. In his early work, he elaborated critiques of histori ...

, characterize philosophy as a "rigorous science" investigating

essence Essence () has various meanings and uses for different thinkers and in different contexts. It is used in philosophy and theology as a designation for the property (philosophy), property or set of properties or attributes that make an entity the ...

s. They practice a radical suspension of theoretical assumptions about reality to get back to the "things themselves", that is, as originally given in experience. They contend that this base-level of experience provides the foundation for higher-order theoretical knowledge, and that one needs to understand the former to understand the latter. An early approach found in

ancient Greek Ancient Greek (, ; ) includes the forms of the Greek language used in ancient Greece and the classical antiquity, ancient world from around 1500 BC to 300 BC. It is often roughly divided into the following periods: Mycenaean Greek (), Greek ...

and

Roman philosophy Ancient Roman philosophy is philosophy as it was practiced in the Roman Republic and its successor state, the Roman Empire. Roman philosophy includes not only philosophy written in Latin, but also philosophy written in Greek in the late Republic ...

is that philosophy is the spiritual practice of developing one's rational capacities. This practice is an expression of the philosopher's love of wisdom and has the aim of improving one's

well-being Well-being is what is Intrinsic value (ethics), ultimately good for a person. Also called "welfare" and "quality of life", it is a measure of how well life is going for someone. It is a central goal of many individual and societal endeavors. ...

by leading a reflective life. For example, the

Stoics Stoicism is a school of Hellenistic philosophy that flourished in ancient Greece and Rome. The Stoics believed that the universe operated according to reason, ''i.e.'' by a God which is immersed in nature itself. Of all the schools of ancient ...

saw philosophy as an exercise to train the mind and thereby achieve

eudaimonia Eudaimonia (; ) is a Greek word literally translating to the state or condition of ''good spirit'', and which is commonly translated as ''happiness'' or ''Well-being, welfare''. In the works of Aristotle, ''eudaimonia'' was the term for the hig ...

and flourish in life.

History

As a discipline, the history of philosophy aims to provide a systematic and chronological exposition of philosophical concepts and doctrines. Some theorists see it as a part of

intellectual history Intellectual history (also the history of ideas) is the study of the history of human thought and of intellectuals, people who conceptualization, conceptualize, discuss, write about, and concern themselves with ideas. The investigative premise of ...

, but it also investigates questions not covered by intellectual history such as whether the theories of past philosophers are true and have remained philosophically relevant. The history of philosophy is primarily concerned with theories based on rational inquiry and argumentation; some historians understand it in a looser sense that includes

myth Myth is a genre of folklore consisting primarily of narratives that play a fundamental role in a society. For scholars, this is very different from the vernacular usage of the term "myth" that refers to a belief that is not true. Instead, the ...

s, religious teachings, and proverbial lore. Influential traditions in the history of philosophy include

Western Western may refer to: Places *Western, Nebraska, a village in the US *Western, New York, a town in the US *Western Creek, Tasmania, a locality in Australia *Western Junction, Tasmania, a locality in Australia *Western world, countries that id ...

, Arabic–Persian, Indian, and

Chinese philosophy Chinese philosophy (Simplified Chinese characters, simplified Chinese: 中国哲学; Traditional Chinese characters, traditional Chinese: 中國哲學) refers to the philosophical traditions that originated and developed within the historical ...

. Other philosophical traditions are

Japanese philosophy Japanese philosophy has historically been a fusion of both indigenous Shinto and continental religions, such as Buddhism, Taoism and Confucianism. Formerly heavily influenced by both Chinese philosophy and Indian philosophy, as with Mitogaku and ...

, Latin American philosophy, and

African philosophy African philosophy is the philosophical discourse produced using indigenous African thought systems. :African philosophers, African philosophers are found in the various academic fields of present philosophy, such as metaphysics, epistemology, E ...

.

Western

Western philosophy originated in

Ancient Greece Ancient Greece () was a northeastern Mediterranean civilization, existing from the Greek Dark Ages of the 12th–9th centuries BC to the end of classical antiquity (), that comprised a loose collection of culturally and linguistically r ...

in the 6th century BCE with the

pre-Socratics Pre-Socratic philosophy, also known as early Greek philosophy, is ancient Greek philosophy before Socrates. Pre-Socratic philosophers were mostly interested in cosmology, the beginning and the substance of the universe, but the inquiries of the ...

. They attempted to provide rational explanations of the

cosmos The cosmos (, ; ) is an alternative name for the universe or its nature or order. Usage of the word ''cosmos'' implies viewing the universe as a complex and orderly system or entity. The cosmos is studied in cosmologya broad discipline covering ...

as a whole. The philosophy following them was shaped by

Socrates Socrates (; ; – 399 BC) was a Ancient Greek philosophy, Greek philosopher from Classical Athens, Athens who is credited as the founder of Western philosophy and as among the first moral philosophers of the Ethics, ethical tradition ...

(469–399 BCE),

Plato Plato ( ; Greek language, Greek: , ; born BC, died 348/347 BC) was an ancient Greek philosopher of the Classical Greece, Classical period who is considered a foundational thinker in Western philosophy and an innovator of the writte ...

(427–347 BCE), and

Aristotle Aristotle (; 384–322 BC) was an Ancient Greek philosophy, Ancient Greek philosopher and polymath. His writings cover a broad range of subjects spanning the natural sciences, philosophy, linguistics, economics, politics, psychology, a ...

(384–322 BCE). They expanded the range of topics to questions like how people should act, how to arrive at knowledge, and what the nature of reality and

mind The mind is that which thinks, feels, perceives, imagines, remembers, and wills. It covers the totality of mental phenomena, including both conscious processes, through which an individual is aware of external and internal circumstances ...

is. The later part of the ancient period was marked by the emergence of philosophical movements, for example,

Epicureanism Epicureanism is a system of philosophy founded 307 BCE based upon the teachings of Epicurus, an ancient Greek philosopher. Epicurus was an atomist and materialist, following in the steps of Democritus. His materialism led him to religious s ...

,

Stoicism Stoicism is a school of Hellenistic philosophy that flourished in ancient Greece and Rome. The Stoics believed that the universe operated according to reason, ''i.e.'' by a God which is immersed in nature itself. Of all the schools of ancient ...

,

Skepticism Skepticism ( US) or scepticism ( UK) is a questioning attitude or doubt toward knowledge claims that are seen as mere belief or dogma. For example, if a person is skeptical about claims made by their government about an ongoing war then the p ...

, and

Neoplatonism Neoplatonism is a version of Platonic philosophy that emerged in the 3rd century AD against the background of Hellenistic philosophy and religion. The term does not encapsulate a set of ideas as much as a series of thinkers. Among the common id ...

. The medieval period started in the 5th century CE. Its focus was on religious topics and many thinkers used ancient philosophy to explain and further elaborate

Christian doctrine Christian theology is the theology – the systematic study of the divine and religion – of Christianity, Christian belief and practice. It concentrates primarily upon the texts of the Old Testament and of the New Testament, as well as on Ch ...

s. The

Renaissance The Renaissance ( , ) is a Periodization, period of history and a European cultural movement covering the 15th and 16th centuries. It marked the transition from the Middle Ages to modernity and was characterized by an effort to revive and sur ...

period started in the 14th century and saw a renewed interest in schools of ancient philosophy, in particular

Platonism Platonism is the philosophy of Plato and philosophical systems closely derived from it, though contemporary Platonists do not necessarily accept all doctrines of Plato. Platonism has had a profound effect on Western thought. At the most fundam ...

.

Humanism Humanism is a philosophy, philosophical stance that emphasizes the individual and social potential, and Agency (philosophy), agency of human beings, whom it considers the starting point for serious moral and philosophical inquiry. The me ...

also emerged in this period. The modern period started in the 17th century. One of its central concerns was how philosophical and scientific knowledge are created. Specific importance was given to the role of reason and sensory experience. Many of these innovations were used in the Enlightenment movement to challenge traditional authorities. Several attempts to develop comprehensive systems of philosophy were made in the 19th century, for instance, by

German idealism German idealism is a philosophical movement that emerged in Germany in the late 18th and early 19th centuries. It developed out of the work of Immanuel Kant in the 1780s and 1790s, and was closely linked both with Romanticism and the revolutionary ...

and

Marxism Marxism is a political philosophy and method of socioeconomic analysis. It uses a dialectical and materialist interpretation of historical development, better known as historical materialism, to analyse class relations, social conflict, ...

. Influential developments in 20th-century philosophy were the emergence and application of

formal logic Logic is the study of correct reasoning. It includes both formal and informal logic. Formal logic is the study of deductively valid inferences or logical truths. It examines how conclusions follow from premises based on the structure o ...

, the focus on the role of language as well as

pragmatism Pragmatism is a philosophical tradition that views language and thought as tools for prediction, problem solving, and action, rather than describing, representing, or mirroring reality. Pragmatists contend that most philosophical topics� ...

, and movements in

continental philosophy Continental philosophy is a group of philosophies prominent in 20th-century continental Europe that derive from a broadly Kantianism, Kantian tradition.Continental philosophers usually identify such conditions with the transcendental subject or ...

like phenomenology,

existentialism Existentialism is a family of philosophical views and inquiry that explore the human individual's struggle to lead an authentic life despite the apparent absurdity or incomprehensibility of existence. In examining meaning, purpose, and valu ...

, and

post-structuralism Post-structuralism is a philosophical movement that questions the objectivity or stability of the various interpretive structures that are posited by structuralism and considers them to be constituted by broader systems of Power (social and poli ...

. The 20th century saw a rapid expansion of academic philosophy in terms of the number of philosophical publications and philosophers working at

academic institution An academic institution is an educational institution dedicated to education and research, which grants academic degrees. See also academy and university. Types * Primary schools – (from French ''école primaire'') institutions where childre ...

s. There was also a noticeable growth in the number of female philosophers, but they still remained underrepresented.

Arabic–Persian

Arabic–Persian philosophy arose in the early 9th century CE as a response to discussions in the Islamic theological tradition. Its classical period lasted until the 12th century CE and was strongly influenced by ancient Greek philosophers. It employed their ideas to elaborate and interpret the teachings of the

Quran The Quran, also Romanization, romanized Qur'an or Koran, is the central religious text of Islam, believed by Muslims to be a Waḥy, revelation directly from God in Islam, God (''Allah, Allāh''). It is organized in 114 chapters (, ) which ...

.

Al-Kindi Abū Yūsuf Yaʻqūb ibn ʼIsḥāq aṣ-Ṣabbāḥ al-Kindī (; ; ; ) was an Arab Muslim polymath active as a philosopher, mathematician, physician, and music theorist Music theory is the study of theoretical frameworks for understandin ...

(801–873 CE) is usually regarded as the first philosopher of this tradition. He translated and interpreted many works of Aristotle and Neoplatonists in his attempt to show that there is a harmony between

reason Reason is the capacity of consciously applying logic by drawing valid conclusions from new or existing information, with the aim of seeking the truth. It is associated with such characteristically human activities as philosophy, religion, scien ...

and

faith Faith is confidence or trust in a person, thing, or concept. In the context of religion, faith is " belief in God or in the doctrines or teachings of religion". According to the Merriam-Webster's Dictionary, faith has multiple definitions, inc ...

.

Avicenna Ibn Sina ( – 22 June 1037), commonly known in the West as Avicenna ( ), was a preeminent philosopher and physician of the Muslim world, flourishing during the Islamic Golden Age, serving in the courts of various Iranian peoples, Iranian ...

(980–1037 CE) also followed this goal and developed a comprehensive philosophical system to provide a rational understanding of reality encompassing science, religion, and mysticism.

Al-Ghazali Al-Ghazali ( – 19 December 1111), archaically Latinized as Algazelus, was a Shafi'i Sunni Muslim scholar and polymath. He is known as one of the most prominent and influential jurisconsults, legal theoreticians, muftis, philosophers, the ...

(1058–1111 CE) was a strong critic of the idea that reason can arrive at a true understanding of reality and God. He formulated a detailed critique of philosophy and tried to assign philosophy a more limited place besides the teachings of the Quran and mystical insight. Following Al-Ghazali and the end of the classical period, the influence of philosophical inquiry waned.

Mulla Sadra Ṣadr ad-Dīn Muḥammad Shīrāzī, more commonly known as Mullā Ṣadrā (; ; c. 1571/2 – c. 1635/40 CE / 980 – 1050 AH), was a Persians, Persian Twelver Shi'a, Shi'i Islamic philosophy, Islamic mystic, philosopher, Kalam, theologian, a ...

(1571–1636 CE) is often regarded as one of the most influential philosophers of the subsequent period. The increasing influence of Western thought and institutions in the 19th and 20th centuries gave rise to the intellectual movement of

Islamic modernism Islamic modernism is a movement that has been described as "the first Muslim ideological response to the Western cultural challenge", attempting to reconcile the Islamic faith with values perceived as modern such as democracy, civil rights, rati ...

, which aims to understand the relation between traditional Islamic beliefs and modernity.

Indian

Raja Ravi Varma - Sankaracharya - cropped

One of the distinguishing features of Indian philosophy is that it integrates the exploration of the nature of reality, the ways of arriving at knowledge, and the spiritual question of how to reach enlightenment. It started around 900 BCE when the

Vedas FIle:Atharva-Veda samhita page 471 illustration.png, upright=1.2, The Vedas are ancient Sanskrit texts of Hinduism. Above: A page from the ''Atharvaveda''. The Vedas ( or ; ), sometimes collectively called the Veda, are a large body of relig ...

were written. They are the foundational scriptures of

Hinduism Hinduism () is an Hypernymy and hyponymy, umbrella term for a range of Indian religions, Indian List of religions and spiritual traditions#Indian religions, religious and spiritual traditions (Sampradaya, ''sampradaya''s) that are unified ...

and contemplate issues concerning the relation between the

self In philosophy, the self is an individual's own being, knowledge, and values, and the relationship between these attributes. The first-person perspective distinguishes selfhood from personal identity. Whereas "identity" is (literally) same ...

and

ultimate reality Ultimate reality is "the supreme, final, and fundamental power in all reality". It refers to the most fundamental fact about reality, especially when it is seen as also being the most valuable fact. This may overlap with the concept of the Absolut ...

as well as the question of how

souls The soul is the purported immaterial aspect or essence of a living being. It is typically believed to be immortal and to exist apart from the material world. The three main theories that describe the relationship between the soul and the bod ...

are reborn based on their past actions. This period also saw the emergence of non-Vedic teachings, like

Buddhism Buddhism, also known as Buddhadharma and Dharmavinaya, is an Indian religion and List of philosophies, philosophical tradition based on Pre-sectarian Buddhism, teachings attributed to the Buddha, a wandering teacher who lived in the 6th or ...

and

Jainism Jainism ( ), also known as Jain Dharma, is an Indian religions, Indian religion whose three main pillars are nonviolence (), asceticism (), and a rejection of all simplistic and one-sided views of truth and reality (). Jainism traces its s ...

. Buddhism was founded by Gautama Siddhartha (563–483 BCE), who challenged the Vedic idea of a permanent self and proposed a path to liberate oneself from

suffering Suffering, or pain in a broad sense, may be an experience of unpleasantness or aversion, possibly associated with the perception of harm or threat of harm in an individual. Suffering is the basic element that makes up the negative valence (psyc ...

. Jainism was founded by

Mahavira Mahavira (Devanagari: महावीर, ), also known as Vardhamana (Devanagari: वर्धमान, ), was the 24th ''Tirthankara'' (Supreme Preacher and Ford Maker) of Jainism. Although the dates and most historical details of his lif ...

(599–527 BCE), who emphasized non-violence as well as respect toward all forms of life. The subsequent classical period started roughly 200 BCE and was characterized by the emergence of the six orthodox schools of Hinduism: Nyāyá,

Vaiśeṣika Vaisheshika (IAST: Vaiśeṣika; ; ) is one of the six schools of Hindu philosophy from ancient India. In its early stages, Vaiśeṣika was an independent philosophy with its own metaphysics, epistemology, logic, ethics, and soteriology. Over t ...

,

Sāṃkhya Samkhya or Sankhya (; ) is a Dualism (Indian philosophy), dualistic Āstika and nāstika, orthodox school of Hindu philosophy. It views reality as composed of two independent principles, ''purusha, Puruṣa'' ('consciousness' or spirit) and ''P ...

,

Yoga Yoga (UK: , US: ; 'yoga' ; ) is a group of physical, mental, and spiritual practices or disciplines that originated with its own philosophy in ancient India, aimed at controlling body and mind to attain various salvation goals, as pra ...

,

Mīmāṃsā ''Mīmāṁsā'' (Sanskrit: मीमांसा; IAST: Mīmāṃsā) is a Sanskrit word that means "reflection" or "critical investigation" and thus refers to a tradition of contemplation which reflected on the meanings of certain Vedic tex ...

, and

Vedanta ''Vedanta'' (; , ), also known as ''Uttara Mīmāṃsā'', is one of the six orthodox (Āstika and nāstika, ''āstika'') traditions of Hindu philosophy and textual exegesis. The word ''Vedanta'' means 'conclusion of the Vedas', and encompa ...

. The school of Advaita Vedanta developed later in this period. It was systematized by

Adi Shankara Adi Shankara (8th c. CE), also called Adi Shankaracharya (, ), was an Indian Vedanga, Vedic scholar, Hindu philosophy, philosopher and teacher (''acharya'') of Advaita Vedanta. Reliable information on Shankara's actual life is scant, and h ...

(–750 CE), who held that everything is one and that the impression of a universe consisting of many distinct entities is an

illusion An illusion is a distortion of the senses, which can reveal how the mind normally organizes and interprets sensory stimulation. Although illusions distort the human perception of reality, they are generally shared by most people. Illusions may ...

. A slightly different perspective was defended by

Ramanuja Ramanuja ('; Middle Tamil: Rāmāṉujam; Classical Sanskrit: Rāmānuja; 1077 – 1157), also known as Ramanujacharya, was an Indian Hindu philosopher, guru and social reformer. He is one of the most important exponents of the Sri Vaishnavi ...

(1017–1137 CE), who founded the school of

Vishishtadvaita Vedanta Vishishtadvaita ( IAST '; ) is a school of Hindu philosophy belonging to the Vedanta tradition. Vedanta refers to the profound interpretation of the Vedas based on Prasthanatrayi. Vishishta Advaita, meaning "non-duality with distinctions", i ...

and argued that individual entities are real as aspects or parts of the underlying unity. He also helped to popularize the

Bhakti movement The Bhakti movement was a significant religious movement in medieval Hinduism that sought to bring religious reforms to all strata of society by adopting the method of Bhakti, devotion to achieve salvation. Originating in Tamilakam during 6t ...

, which taught devotion toward the divine as a spiritual path and lasted until the 17th to 18th centuries CE. The modern period began roughly 1800 CE and was shaped by encounters with Western thought. Philosophers tried to formulate comprehensive systems to harmonize diverse philosophical and religious teachings. For example,

Swami Vivekananda Swami Vivekananda () (12 January 1863 – 4 July 1902), born Narendranath Datta, was an Indian Hindus, Hindu monk, philosopher, author, religious teacher, and the chief disciple of the Indian mystic Ramakrishna. Vivekananda was a major figu ...

(1863–1902 CE) used the teachings of Advaita Vedanta to argue that all the different religions are valid paths toward the one divine.

Chinese

Half Portraits of the Great Sage and Virtuous Men of Old - Confucius

Chinese philosophy is particularly interested in practical questions associated with right social conduct, government, and

self-cultivation Self-cultivation or personal cultivation () is the development of one's mind or capacities through one's own efforts. Self-cultivation is the cultivation, integration, and coordination of mind and body. Although self-cultivation may be practice ...

. Many schools of thought emerged in the 6th century BCE in competing attempts to resolve the political turbulence of that period. The most prominent among them were

Confucianism Confucianism, also known as Ruism or Ru classicism, is a system of thought and behavior originating in ancient China, and is variously described as a tradition, philosophy, Religious Confucianism, religion, theory of government, or way of li ...

and

Daoism Taoism or Daoism (, ) is a diverse philosophical and religious tradition indigenous to China, emphasizing harmony with the Tao ( zh, p=dào, w=tao4). With a range of meaning in Chinese philosophy, translations of Tao include 'way', 'road', ...

. Confucianism was founded by

Confucius Confucius (; pinyin: ; ; ), born Kong Qiu (), was a Chinese philosopher of the Spring and Autumn period who is traditionally considered the paragon of Chinese sages. Much of the shared cultural heritage of the Sinosphere originates in the phil ...

(551–479 BCE). It focused on different forms of moral

virtue A virtue () is a trait of excellence, including traits that may be morality, moral, social, or intellectual. The cultivation and refinement of virtue is held to be the "good of humanity" and thus is Value (ethics), valued as an Telos, end purpos ...

s and explored how they lead to harmony in society. Daoism was founded by

Laozi Laozi (), also romanized as Lao Tzu #Name, among other ways, was a semi-legendary Chinese philosophy, Chinese philosopher and author of the ''Tao Te Ching'' (''Laozi''), one of the foundational texts of Taoism alongside the ''Zhuangzi (book) ...

(6th century BCE) and examined how humans can live in harmony with nature by following the Dao or the natural order of the universe. Other influential early schools of thought were

Mohism Mohism or Moism (, ) was an ancient Chinese philosophy of ethics and logic, rational thought, and scientific technology developed by the scholars who studied under the ancient Chinese philosopher Mozi (), embodied in an eponymous book: the '' ...

, which developed an early form of altruistic

consequentialism In moral philosophy, consequentialism is a class of normative, teleological ethical theories that holds that the consequences of one's conduct are the ultimate basis for judgement about the rightness or wrongness of that conduct. Thus, from a ...

, and Legalism, which emphasized the importance of a strong state and strict laws. Buddhism was introduced to China in the 1st century CE and diversified into new forms of Buddhism. Starting in the 3rd century CE, the school of

Xuanxue Xuanxue (), sometimes called Neo-Daoism (Neo-Taoism), is a metaphysical Post-classical history, post-classical Chinese philosophy from the Six Dynasties (222-589), bringing together Taoist and Confucianism, Confucian beliefs through revision and di ...

emerged. It interpreted earlier Daoist works with a specific emphasis on metaphysical explanations.

Neo-Confucianism Neo-Confucianism (, often shortened to ''lǐxué'' 理學, literally "School of Principle") is a moral, ethical, and metaphysical Chinese philosophy influenced by Confucianism, which originated with Han Yu (768–824) and Li Ao (772–841) i ...

developed in the 11th century CE. It systematized previous Confucian teachings and sought a metaphysical foundation of ethics. The modern period in Chinese philosophy began in the early 20th century and was shaped by the influence of and reactions to Western philosophy. The emergence of Chinese Marxism—which focused on

class struggle In political science, the term class conflict, class struggle, or class war refers to the economic antagonism and political tension that exist among social classes because of clashing interests, competition for limited resources, and inequali ...

,

socialism Socialism is an economic ideology, economic and political philosophy encompassing diverse Economic system, economic and social systems characterised by social ownership of the means of production, as opposed to private ownership. It describes ...

, and

communism Communism () is a political sociology, sociopolitical, political philosophy, philosophical, and economic ideology, economic ideology within the history of socialism, socialist movement, whose goal is the creation of a communist society, a ...

—resulted in a significant transformation of the political landscape. Another development was the emergence of

New Confucianism New Confucianism () is an intellectual movement of Confucianism that began in the early 20th century in Republic of China (1912–1949), Republican China, and further developed in post-Mao era People's Republic of China, contemporary China. I ...

, which aims to modernize and rethink Confucian teachings to explore their compatibility with democratic ideals and modern science.

Other traditions

Traditional Japanese philosophy assimilated and synthesized ideas from different traditions, including the indigenous

Shinto , also called Shintoism, is a religion originating in Japan. Classified as an East Asian religions, East Asian religion by Religious studies, scholars of religion, it is often regarded by its practitioners as Japan's indigenous religion and as ...

religion and Chinese and Indian thought in the forms of Confucianism and Buddhism, both of which entered Japan in the 6th and 7th centuries. Its practice is characterized by active interaction with reality rather than disengaged examination. Neo-Confucianism became an influential school of thought in the 16th century and the following

Edo period The , also known as the , is the period between 1600 or 1603 and 1868 in the history of Japan, when the country was under the rule of the Tokugawa shogunate and some 300 regional ''daimyo'', or feudal lords. Emerging from the chaos of the Sengok ...

and prompted a greater focus on language and the natural world. The Kyoto School emerged in the 20th century and integrated Eastern spirituality with Western philosophy in its exploration of concepts like absolute nothingness (''zettai-mu''), place (''basho''), and the

self In philosophy, the self is an individual's own being, knowledge, and values, and the relationship between these attributes. The first-person perspective distinguishes selfhood from personal identity. Whereas "identity" is (literally) same ...

. Latin American philosophy in the pre-colonial period was practiced by indigenous civilizations and explored questions concerning the nature of reality and the role of humans. It has similarities to indigenous North American philosophy, which covered themes such as the interconnectedness of all things. Latin American philosophy during the colonial period, starting around 1550, was dominated by religious philosophy in the form of

scholasticism Scholasticism was a medieval European philosophical movement or methodology that was the predominant education in Europe from about 1100 to 1700. It is known for employing logically precise analyses and reconciling classical philosophy and Ca ...

. Influential topics in the post-colonial period were

positivism Positivism is a philosophical school that holds that all genuine knowledge is either true by definition or positivemeaning '' a posteriori'' facts derived by reason and logic from sensory experience.John J. Macionis, Linda M. Gerber, ''Soci ...

, the philosophy of liberation, and the exploration of identity and culture. Early African philosophy was primarily conducted and transmitted orally. It focused on community, morality, and ancestral ideas, encompassing folklore, wise sayings, religious ideas, and philosophical concepts like

Ubuntu Ubuntu ( ) is a Linux distribution based on Debian and composed primarily of free and open-source software. Developed by the British company Canonical (company), Canonical and a community of contributors under a Meritocracy, meritocratic gover ...

. Systematic African philosophy emerged at the beginning of the 20th century. It discusses topics such as ethnophilosophy,

négritude ''Négritude'' (from French "nègre" and "-itude" to denote a condition that can be translated as "Blackness") is a framework of critique and literary theory, mainly developed by francophone intellectuals, writers, and politicians in the Africa ...

,

pan-Africanism Pan-Africanism is a nationalist movement that aims to encourage and strengthen bonds of solidarity between all Indigenous peoples of Africa, indigenous peoples and diasporas of African ancestry. Based on a common goal dating back to the Atla ...

, Marxism,

postcolonialism Postcolonialism (also post-colonial theory) is the critical academic study of the cultural, political and economic consequences of colonialism and imperialism, focusing on the impact of human control and extractivism, exploitation of colonized pe ...

, the role of cultural identity,

relativism Relativism is a family of philosophical views which deny claims to absolute objectivity within a particular domain and assert that valuations in that domain are relative to the perspective of an observer or the context in which they are assess ...

, African epistemology, and the critique of

Eurocentrism Eurocentrism (also Eurocentricity or Western-centrism) refers to viewing Western world, the West as the center of world events or superior to other cultures. The exact scope of Eurocentrism varies from the entire Western world to just the con ...

.

Core branches

Philosophical questions can be grouped into several branches. These groupings allow philosophers to focus on a set of similar topics and interact with other thinkers who are interested in the same questions. Epistemology, ethics, logic, and metaphysics are sometimes listed as the main branches. There are many other subfields besides them and the different divisions are neither exhaustive nor mutually exclusive. For example, political philosophy, ethics, and

aesthetics Aesthetics (also spelled esthetics) is the branch of philosophy concerned with the nature of beauty and taste (sociology), taste, which in a broad sense incorporates the philosophy of art.Slater, B. H.Aesthetics ''Internet Encyclopedia of Ph ...

are sometimes linked under the general heading of

value theory Value theory, also called ''axiology'', studies the nature, sources, and types of Value (ethics and social sciences), values. It is a branch of philosophy and an interdisciplinary field closely associated with social sciences such as economics, ...

as they investigate

normative Normativity is the phenomenon in human societies of designating some actions or outcomes as good, desirable, or permissible, and others as bad, undesirable, or impermissible. A Norm (philosophy), norm in this sense means a standard for evaluatin ...

or evaluative aspects. Furthermore, philosophical inquiry sometimes overlaps with other disciplines in the natural and social sciences, religion, and mathematics.

Epistemology

Epistemology is the branch of philosophy that studies knowledge. It is also known as ''theory of knowledge'' and aims to understand what knowledge is, how it arises, what its limits are, and what value it has. It further examines the nature of

truth Truth or verity is the Property (philosophy), property of being in accord with fact or reality.Merriam-Webster's Online Dictionarytruth, 2005 In everyday language, it is typically ascribed to things that aim to represent reality or otherwise cor ...

,

belief A belief is a subjective Attitude (psychology), attitude that something is truth, true or a State of affairs (philosophy), state of affairs is the case. A subjective attitude is a mental state of having some Life stance, stance, take, or opinion ...

, justification, and

rationality Rationality is the quality of being guided by or based on reason. In this regard, a person acts rationally if they have a good reason for what they do, or a belief is rational if it is based on strong evidence. This quality can apply to an ab ...

. Some of the questions addressed by epistemologists include "By what method(s) can one acquire knowledge?"; "How is truth established?"; and "Can we prove causal relations?" Epistemology is primarily interested in

declarative knowledge Declarative knowledge is an awareness of facts that can be expressed using declarative sentences. It is also called theoretical knowledge, descriptive knowledge, propositional knowledge, and knowledge-that. It is not restricted to one specific ...

or knowledge of facts, like knowing that Princess Diana died in 1997. But it also investigates practical knowledge, such as knowing how to ride a bicycle, and

knowledge by acquaintance Bertrand Russell makes a distinction between two different kinds of knowledge: knowledge by acquaintance and knowledge by description. Whereas knowledge by description is something like ordinary propositional knowledge (e.g. "I know that snow i ...

, for example, knowing a celebrity personally. One area in epistemology is the ''

analysis of knowledge Definitions of knowledge aim to identify the Essence, essential features of knowledge. Closely related terms are conception of knowledge, theory of knowledge, and analysis of knowledge. Some general features of knowledge are widely accepted among p ...

''. It assumes that declarative knowledge is a combination of different parts and attempts to identify what those parts are. An influential theory in this area claims that knowledge has three components: it is a ''belief'' that is ''justified'' and ''true''. This theory is controversial and the difficulties associated with it are known as the Gettier problem. Alternative views state that knowledge requires additional components, like the absence of luck; different components, like the manifestation of cognitive virtues instead of justification; or they deny that knowledge can be analyzed in terms of other phenomena. Another area in epistemology asks how people acquire knowledge. Often-discussed sources of knowledge are

perception Perception () is the organization, identification, and interpretation of sensory information in order to represent and understand the presented information or environment. All perception involves signals that go through the nervous syste ...

,

introspection Introspection is the examination of one's own conscious thoughts and feelings. In psychology, the process of introspection relies on the observation of one's mental state, while in a spiritual context it may refer to the examination of one's s ...

,

memory Memory is the faculty of the mind by which data or information is encoded, stored, and retrieved when needed. It is the retention of information over time for the purpose of influencing future action. If past events could not be remembe ...

,

inference Inferences are steps in logical reasoning, moving from premises to logical consequences; etymologically, the word '' infer'' means to "carry forward". Inference is theoretically traditionally divided into deduction and induction, a distinct ...

, and

testimony Testimony is a solemn attestation as to the truth of a matter. Etymology The words "testimony" and "testify" both derive from the Latin word ''testis'', referring to the notion of a disinterested third-party witness. Law In the law, testimon ...

. According to

empiricists In philosophy, empiricism is an epistemological view which holds that true knowledge or justification comes only or primarily from sensory experience and empirical evidence. It is one of several competing views within epistemology, along ...

, all knowledge is based on some form of experience. Rationalists reject this view and hold that some forms of knowledge, like innate knowledge, are not acquired through experience. The

regress problem Infinite regress is a philosophical concept to describe a series of entities. Each entity in the series depends on its predecessor, following a recursive principle. For example, the epistemic regress is a series of beliefs in which the justif ...

is a common issue in relation to the sources of knowledge and the justification they offer. It is based on the idea that beliefs require some kind of reason or evidence to be justified. The problem is that the source of justification may itself be in need of another source of justification. This leads to an

infinite regress Infinite regress is a philosophical concept to describe a series of entities. Each entity in the series depends on its predecessor, following a recursive principle. For example, the epistemic regress is a series of beliefs in which the justi ...

or

circular reasoning Circular reasoning (, "circle in proving"; also known as circular logic) is a fallacy, logical fallacy in which the reasoner begins with what they are trying to end with. Circular reasoning is not a formal logical fallacy, but a pragmatic defect ...

. Foundationalists avoid this conclusion by arguing that some sources can provide justification without requiring justification themselves. Another solution is presented by coherentists, who state that a belief is justified if it coheres with other beliefs of the person. Many discussions in epistemology touch on the topic of

philosophical skepticism Philosophical skepticism (UK spelling: scepticism; from Ancient Greek, Greek σκέψις ''skepsis'', "inquiry") is a family of philosophical views that question the possibility of knowledge. It differs from other forms of skepticism in that ...

, which raises doubts about some or all claims to knowledge. These doubts are often based on the idea that knowledge requires absolute certainty and that humans are unable to acquire it.

Ethics

Ethics, also known as moral philosophy, studies what constitutes right conduct. It is also concerned with the moral

evaluation In common usage, evaluation is a systematic determination and assessment of a subject's merit, worth and significance, using criteria governed by a set of Standardization, standards. It can assist an organization, program, design, project or any o ...

of character traits and institutions. It explores what the standards of

morality Morality () is the categorization of intentions, Decision-making, decisions and Social actions, actions into those that are ''proper'', or ''right'', and those that are ''improper'', or ''wrong''. Morality can be a body of standards or principle ...

are and how to live a good life. Philosophical ethics addresses such basic questions as "Are moral obligations relative?"; "Which has priority: well-being or obligation?"; and "What gives life meaning?" The main branches of ethics are

meta-ethics In metaphilosophy and ethics, metaethics is the study of the nature, scope, ground, and meaning of moral judgment, ethical belief, or values. It is one of the three branches of ethics generally studied by philosophers, the others being normativ ...

,

normative ethics Normative ethics is the study of ethics, ethical behaviour and is the branch of Philosophy, philosophical ethics that investigates questions regarding how one ought to act, in a Morality, moral sense. Normative ethics is distinct from metaethics i ...

, and

applied ethics Applied ethics is the practical aspect of morality, moral considerations. It is ethics with respect to real-world actions and their moral considerations in private and public life, the professions, health, technology, law, and leadership. For ex ...

. Meta-ethics asks abstract questions about the nature and sources of morality. It analyzes the meaning of ethical concepts, like ''right action'' and ''

obligation An obligation is a course of action which someone is required to take, be it a legal obligation or a moral obligation. Obligations are constraints; they limit freedom. People who are under obligations may choose to freely act under obligations. ...

''. It also investigates whether ethical theories can be true in an absolute sense and how to acquire knowledge of them. Normative ethics encompasses general theories of how to distinguish between right and wrong conduct. It helps guide moral decisions by examining what moral obligations and rights people have. Applied ethics studies the consequences of the general theories developed by normative ethics in specific situations, for example, in the workplace or for medical treatments. Within contemporary normative ethics, consequentialism,

deontology In moral philosophy, deontological ethics or deontology (from Greek language, Greek: and ) is the normative ethics, normative ethical theory that the morality of an action should be based on whether that action itself is right or wrong under a ...

, and

virtue ethics Virtue ethics (also aretaic ethics, from Greek []) is a philosophical approach that treats virtue and moral character, character as the primary subjects of ethics, in contrast to other ethical systems that put consequences of voluntary acts, pri ...

are influential schools of thought. ''Consequentialists'' judge actions based on their consequences. One such view is

utilitarianism In ethical philosophy, utilitarianism is a family of normative ethical theories that prescribe actions that maximize happiness and well-being for the affected individuals. In other words, utilitarian ideas encourage actions that lead to the ...

, which argues that actions should increase overall happiness while minimizing suffering. ''Deontologists'' judge actions based on whether they follow moral duties, such as abstaining from lying or killing. According to them, what matters is that actions are in tune with those duties and not what consequences they have. ''Virtue theorists'' judge actions based on how the moral character of the agent is expressed. According to this view, actions should conform to what an ideally virtuous agent would do by manifesting virtues like

generosity Generosity (also called largesse) is the virtue of being liberal in charity (practice), giving, often as gifts. Generosity is regarded as a virtue by various world religions and List of philosophies, philosophies and is often celebrated in cultur ...

and

honesty Honesty or truthfulness is a facet of moral character that connotes positive and virtue, virtuous attributes such as integrity, truthfulness, straightforwardness (including straightforwardness of conduct: Good faith, earnestness), along with the ...

.

Logic

Logic is the study of correct reasoning. It aims to understand how to distinguish good from bad

argument An argument is a series of sentences, statements, or propositions some of which are called premises and one is the conclusion. The purpose of an argument is to give reasons for one's conclusion via justification, explanation, and/or persu ...

s. It is usually divided into formal and

informal logic Informal logic encompasses the principles of logic and logical thought outside of a formal setting (characterized by the usage of particular statements). However, the precise definition of "informal logic" is a matter of some dispute. Ralph H. ...

. Formal logic uses artificial languages with a precise symbolic representation to investigate arguments. In its search for exact criteria, it examines the structure of arguments to determine whether they are correct or incorrect. Informal logic uses non-formal criteria and standards to assess the correctness of arguments. It relies on additional factors such as content and context. Logic examines a variety of arguments. Deductive arguments are mainly studied by formal logic. An argument is deductively valid if the truth of its

premise A premise or premiss is a proposition—a true or false declarative statement—used in an argument to prove the truth of another proposition called the conclusion. Arguments consist of a set of premises and a conclusion. An argument is meaningf ...

s ensures the truth of its conclusion. Deductively valid arguments follow a

rule of inference Rules of inference are ways of deriving conclusions from premises. They are integral parts of formal logic, serving as norms of the Logical form, logical structure of Validity (logic), valid arguments. If an argument with true premises follows a ...

, like ''

modus ponens In propositional logic, (; MP), also known as (), implication elimination, or affirming the antecedent, is a deductive argument form and rule of inference. It can be summarized as "''P'' implies ''Q.'' ''P'' is true. Therefore, ''Q'' must ...

'', which has the following

logical form In logic, the logical form of a statement is a precisely specified semantic version of that statement in a formal system. Informally, the logical form attempts to formalize a possibly ambiguous statement into a statement with a precise, unamb ...

: "''p''; if ''p'' then ''q''; therefore ''q''". An example is the argument "today is Sunday; if today is Sunday then I don't have to go to work today; therefore I don't have to go to work today". The premises of non-deductive arguments also support their conclusion, although this support does not guarantee that the conclusion is true. One form is

inductive reasoning Inductive reasoning refers to a variety of method of reasoning, methods of reasoning in which the conclusion of an argument is supported not with deductive certainty, but with some degree of probability. Unlike Deductive reasoning, ''deductive'' ...

. It starts from a set of individual cases and uses generalization to arrive at a universal law governing all cases. An example is the inference that "all ravens are black" based on observations of many individual black ravens. Another form is

abductive reasoning Abductive reasoning (also called abduction,For example: abductive inference, or retroduction) is a form of logical inference that seeks the simplest and most likely conclusion from a set of observations. It was formulated and advanced by Ameri ...

. It starts from an observation and concludes that the best explanation of this observation must be true. This happens, for example, when a doctor diagnoses a disease based on the observed symptoms. Logic also investigates incorrect forms of reasoning. They are called ''

fallacies A fallacy is the use of invalid or otherwise faulty reasoning in the construction of an argument that may appear to be well-reasoned if unnoticed. The term was introduced in the Western intellectual tradition by the Aristotelian '' De Sophis ...

'' and are divided into

formal Formal, formality, informal or informality imply the complying with, or not complying with, some set of requirements ( forms, in Ancient Greek). They may refer to: Dress code and events * Formal wear, attire for formal events * Semi-formal atti ...

and

informal fallacies Informal fallacies are a type of incorrect argument in natural language. The source of the error is not just due to the ''form'' of the argument, as is the case for formal fallacies, but can also be due to their ''content'' and ''context''. Falla ...

based on whether the source of the error lies only in the form of the argument or also in its content and context.

Metaphysics

Metaphysics is the study of the most general features of

reality Reality is the sum or aggregate of everything in existence; everything that is not imagination, imaginary. Different Culture, cultures and Academic discipline, academic disciplines conceptualize it in various ways. Philosophical questions abo ...

, such as existence, objects and their

properties Property is the ownership of land, resources, improvements or other tangible objects, or intellectual property. Property may also refer to: Philosophy and science * Property (philosophy), in philosophy and logic, an abstraction characterizing an ...

, wholes and their parts,

space Space is a three-dimensional continuum containing positions and directions. In classical physics, physical space is often conceived in three linear dimensions. Modern physicists usually consider it, with time, to be part of a boundless ...

and

time Time is the continuous progression of existence that occurs in an apparently irreversible process, irreversible succession from the past, through the present, and into the future. It is a component quantity of various measurements used to sequ ...

, events, and causation. There are disagreements about the precise definition of the term and its meaning has changed throughout the ages. Metaphysicians attempt to answer basic questions including " Why is there something rather than nothing?"; "Of what does reality ultimately consist?"; and "Are humans free?" Metaphysics is sometimes divided into general metaphysics and specific or special metaphysics. General metaphysics investigates being as such. It examines the features that all entities have in common. Specific metaphysics is interested in different kinds of being, the features they have, and how they differ from one another. An important area in metaphysics is

ontology Ontology is the philosophical study of existence, being. It is traditionally understood as the subdiscipline of metaphysics focused on the most general features of reality. As one of the most fundamental concepts, being encompasses all of realit ...

. Some theorists identify it with general metaphysics. Ontology investigates concepts like

being Existence is the state of having being or reality in contrast to nonexistence and nonbeing. Existence is often contrasted with essence: the essence of an entity is its essential features or qualities, which can be understood even if one do ...

, becoming, and reality. It studies the

categories of being In ontology, the theory of categories concerns itself with the ''categories of being'': the highest ''genera'' or ''kinds of entities''. To investigate the categories of being, or simply categories, is to determine the most fundamental and the br ...

and asks what exists on the most fundamental level. Another subfield of metaphysics is philosophical cosmology. It is interested in the essence of the world as a whole. It asks questions including whether the universe has a beginning and an end and whether it was created by something else. A key topic in metaphysics concerns the question of whether reality only consists of physical things like matter and energy. Alternative suggestions are that mental entities (such as

soul The soul is the purported Mind–body dualism, immaterial aspect or essence of a Outline of life forms, living being. It is typically believed to be Immortality, immortal and to exist apart from the material world. The three main theories that ...

s and

experience Experience refers to Consciousness, conscious events in general, more specifically to perceptions, or to the practical knowledge and familiarity that is produced by these processes. Understood as a conscious event in the widest sense, experience i ...

s) and abstract entities (such as numbers) exist apart from physical things. Another topic in metaphysics concerns the problem of identity. One question is how much an entity can change while still remaining the same entity. According to one view, entities have essential and accidental features. They can change their accidental features but they cease to be the same entity if they lose an essential feature. A central distinction in metaphysics is between particulars and universals. Universals, like the color red, can exist at different locations at the same time. This is not the case for particulars including individual persons or specific objects. Other metaphysical questions are whether the past fully determines the present and what implications this would have for the existence of

free will Free will is generally understood as the capacity or ability of people to (a) choice, choose between different possible courses of Action (philosophy), action, (b) exercise control over their actions in a way that is necessary for moral respon ...

.

Other major branches

There are many other subfields of philosophy besides its core branches. Some of the most prominent are aesthetics, philosophy of language, philosophy of mind, philosophy of religion, philosophy of science, and political philosophy.

Aesthetics Aesthetics (also spelled esthetics) is the branch of philosophy concerned with the nature of beauty and taste (sociology), taste, which in a broad sense incorporates the philosophy of art.Slater, B. H.Aesthetics ''Internet Encyclopedia of Ph ...

in the philosophical sense is the field that studies the nature and appreciation of

beauty Beauty is commonly described as a feature of objects that makes them pleasure, pleasurable to perceive. Such objects include landscapes, sunsets, humans and works of art. Beauty, art and taste are the main subjects of aesthetics, one of the fie ...

and other aesthetic properties, like the sublime. Although it is often treated together with the

philosophy of art Aesthetics (also spelled esthetics) is the branch of philosophy concerned with the nature of beauty and taste, which in a broad sense incorporates the philosophy of art.Slater, B. H.Aesthetics ''Internet Encyclopedia of Philosophy,'' , acces ...

, aesthetics is a broader category that encompasses other aspects of experience, such as natural beauty. In a more general sense, aesthetics is "critical reflection on art, culture, and

nature Nature is an inherent character or constitution, particularly of the Ecosphere (planetary), ecosphere or the universe as a whole. In this general sense nature refers to the Scientific law, laws, elements and phenomenon, phenomena of the physic ...

". A key question in aesthetics is whether beauty is an objective feature of entities or a subjective aspect of experience. Aesthetic philosophers also investigate the nature of aesthetic experiences and

judgments Judgement (or judgment) is the evaluation of given circumstances to Decision-making, make a decision. Judgement is also the ability to make considered decisions. In an informal context, a judgement is opinion expressed as fact. In the context o ...

. Further topics include the essence of works of art and the processes involved in creating them. The

philosophy of language Philosophy of language refers to the philosophical study of the nature of language. It investigates the relationship between language, language users, and the world. Investigations may include inquiry into the nature of Meaning (philosophy), me ...

studies the nature and function of

language Language is a structured system of communication that consists of grammar and vocabulary. It is the primary means by which humans convey meaning, both in spoken and signed language, signed forms, and may also be conveyed through writing syste ...

. It examines the concepts of meaning,

reference A reference is a relationship between objects in which one object designates, or acts as a means by which to connect to or link to, another object. The first object in this relation is said to ''refer to'' the second object. It is called a ''nam ...

, and truth. It aims to answer questions such as how words are related to things and how language affects human

thought In their most common sense, the terms thought and thinking refer to cognitive processes that can happen independently of sensory stimulation. Their most paradigmatic forms are judging, reasoning, concept formation, problem solving, and de ...

and understanding. It is closely related to the disciplines of logic and linguistics. The philosophy of language rose to particular prominence in the early 20th century in

analytic philosophy Analytic philosophy is a broad movement within Western philosophy, especially English-speaking world, anglophone philosophy, focused on analysis as a philosophical method; clarity of prose; rigor in arguments; and making use of formal logic, mat ...

due to the works of Frege and Russell. One of its central topics is to understand how sentences get their meaning. There are two broad theoretical camps: those emphasizing the formal truth conditions of sentences and those investigating circumstances that determine when it is suitable to use a sentence, the latter of which is associated with

speech act theory In the philosophy of language and linguistics, a speech act is something expressed by an individual that not only presents information but performs an action as well. For example, the phrase "I would like the mashed potatoes; could you please pas ...

. The

philosophy of mind Philosophy of mind is a branch of philosophy that deals with the nature of the mind and its relation to the Body (biology), body and the Reality, external world. The mind–body problem is a paradigmatic issue in philosophy of mind, although a ...

studies the nature of mental phenomena and how they are related to the physical world. It aims to understand different types of

conscious Consciousness, at its simplest, is awareness of a state or object, either internal to oneself or in one's external environment. However, its nature has led to millennia of analyses, explanations, and debate among philosophers, scientists, a ...

and unconscious

mental states A mental state, or a mental property, is a state of mind of a person. Mental states comprise a diverse class, including perception, pain/pleasure experience, belief, desire, intention, emotion, and memory. There is controversy concerning the exact ...

, like

belief A belief is a subjective Attitude (psychology), attitude that something is truth, true or a State of affairs (philosophy), state of affairs is the case. A subjective attitude is a mental state of having some Life stance, stance, take, or opinion ...

s,

desire Desires are states of mind that are expressed by terms like "wanting", "wishing", "longing" or "craving". A great variety of features is commonly associated with desires. They are seen as propositional attitudes towards conceivable states of affa ...

s,

intention An intention is a mental state in which a person commits themselves to a course of action. Having the plan to visit the zoo tomorrow is an example of an intention. The action plan is the ''content'' of the intention while the commitment is the ...

s,

feeling According to the '' APA Dictionary of Psychology'', a feeling is "a self-contained phenomenal experience"; feelings are "subjective, evaluative, and independent of the sensations, thoughts, or images evoking them". The term ''feeling'' is closel ...

s, sensations, and free will. An influential intuition in the philosophy of mind is that there is a distinction between the inner experience of objects and their existence in the external world. The mind-body problem is the problem of explaining how these two types of thing—mind and matter—are related. The main traditional responses are

materialism Materialism is a form of monism, philosophical monism according to which matter is the fundamental Substance theory, substance in nature, and all things, including mind, mental states and consciousness, are results of material interactions. Acco ...

, which assumes that matter is more fundamental;

idealism Idealism in philosophy, also known as philosophical realism or metaphysical idealism, is the set of metaphysics, metaphysical perspectives asserting that, most fundamentally, reality is equivalent to mind, Spirit (vital essence), spirit, or ...

, which assumes that mind is more fundamental; and

dualism Dualism most commonly refers to: * Mind–body dualism, a philosophical view which holds that mental phenomena are, at least in certain respects, not physical phenomena, or that the mind and the body are distinct and separable from one another * P ...

, which assumes that mind and matter are distinct types of entities. In contemporary philosophy, another common view is functionalism, which understands mental states in terms of the functional or causal roles they play. The mind-body problem is closely related to the

hard problem of consciousness In the philosophy of mind, the hard problem of consciousness is to explain why and how humans and other organisms have qualia, phenomenal consciousness, or subjective experience. It is contrasted with the "easy problems" of explaining why and how ...

, which asks how the physical brain can produce qualitatively subjective experiences. The

philosophy of religion Philosophy of religion is "the philosophical examination of the central themes and concepts involved in religious traditions". Philosophical discussions on such topics date from ancient times, and appear in the earliest known Text (literary theo ...

investigates the basic concepts, assumptions, and arguments associated with

religion Religion is a range of social system, social-cultural systems, including designated religious behaviour, behaviors and practices, morals, beliefs, worldviews, religious text, texts, sanctified places, prophecies, ethics in religion, ethics, or ...

. It critically reflects on what religion is, how to define the

divine Divinity (from Latin ) refers to the quality, presence, or nature of that which is divine—a term that, before the rise of monotheism, evoked a broad and dynamic field of sacred power. In the ancient world, divinity was not limited to a singl ...

, and whether one or more gods exist. It also includes the discussion of

worldview A worldview (also world-view) or is said to be the fundamental cognitive orientation of an individual or society encompassing the whole of the individual's or society's knowledge, culture, and Perspective (cognitive), point of view. However, whe ...

s that reject religious doctrines. Further questions addressed by the philosophy of religion are: "How are we to interpret religious language, if not literally?"; "Is divine omniscience compatible with free will?"; and, "Are the great variety of world religions in some way compatible in spite of their apparently contradictory theological claims?" It includes topics from nearly all branches of philosophy. It differs from

theology Theology is the study of religious belief from a Religion, religious perspective, with a focus on the nature of divinity. It is taught as an Discipline (academia), academic discipline, typically in universities and seminaries. It occupies itse ...

since theological debates typically take place within one religious tradition, whereas debates in the philosophy of religion transcend any particular set of theological assumptions. The

philosophy of science Philosophy of science is the branch of philosophy concerned with the foundations, methods, and implications of science. Amongst its central questions are the difference between science and non-science, the reliability of scientific theories, ...

examines the fundamental concepts, assumptions, and problems associated with science. It reflects on what science is and how to distinguish it from

pseudoscience Pseudoscience consists of statements, beliefs, or practices that claim to be both scientific and factual but are incompatible with the scientific method. Pseudoscience is often characterized by contradictory, exaggerated or unfalsifiable cl ...

. It investigates the methods employed by scientists, how their application can result in knowledge, and on what assumptions they are based. It also studies the purpose and implications of science. Some of its questions are "What counts as an adequate explanation?"; "Is a scientific law anything more than a description of a regularity?"; and "Can some special sciences be explained entirely in the terms of a more general science?" It is a vast field that is commonly divided into the philosophy of the

natural sciences Natural science or empirical science is one of the branches of science concerned with the description, understanding and prediction of natural phenomena, based on empirical evidence from observation and experimentation. Mechanisms such as peer ...

and the philosophy of the

social sciences Social science (often rendered in the plural as the social sciences) is one of the branches of science, devoted to the study of society, societies and the Social relation, relationships among members within those societies. The term was former ...

, with further subdivisions for each of the individual sciences under these headings. How these branches are related to one another is also a question in the philosophy of science. Many of its philosophical issues overlap with the fields of metaphysics or epistemology.

Political philosophy Political philosophy studies the theoretical and conceptual foundations of politics. It examines the nature, scope, and Political legitimacy, legitimacy of political institutions, such as State (polity), states. This field investigates different ...

is the philosophical inquiry into the fundamental principles and ideas governing political systems and societies. It examines the basic concepts, assumptions, and arguments in the field of

politics Politics () is the set of activities that are associated with decision-making, making decisions in social group, groups, or other forms of power (social and political), power relations among individuals, such as the distribution of Social sta ...

. It investigates the nature and purpose of

government A government is the system or group of people governing an organized community, generally a State (polity), state. In the case of its broad associative definition, government normally consists of legislature, executive (government), execu ...

and compares its different forms. It further asks under what circumstances the use of political power is legitimate, rather than a form of simple violence. In this regard, it is concerned with the distribution of political power, social and material goods, and

legal rights Some philosophers distinguish two types of rights, natural rights and legal rights. * Natural rights are those that are not dependent on the laws or customs of any particular culture or government, and so are ''universal'', ''fundamental rights ...

. Other topics are

justice In its broadest sense, justice is the idea that individuals should be treated fairly. According to the ''Stanford Encyclopedia of Philosophy'', the most plausible candidate for a core definition comes from the ''Institutes (Justinian), Inst ...

,

liberty Liberty is the state of being free within society from oppressive restrictions imposed by authority on one's way of life, behavior, or political views. The concept of liberty can vary depending on perspective and context. In the Constitutional ...

, equality,

sovereignty Sovereignty can generally be defined as supreme authority. Sovereignty entails hierarchy within a state as well as external autonomy for states. In any state, sovereignty is assigned to the person, body or institution that has the ultimate au ...

, and

nationalism Nationalism is an idea or movement that holds that the nation should be congruent with the state. As a movement, it presupposes the existence and tends to promote the interests of a particular nation, Smith, Anthony. ''Nationalism: Theory, I ...

. Political philosophy involves a general inquiry into normative matters and differs in this respect from

political science Political science is the scientific study of politics. It is a social science dealing with systems of governance and Power (social and political), power, and the analysis of political activities, political philosophy, political thought, polit ...

, which aims to provide empirical descriptions of actually existing states. Political philosophy is often treated as a subfield of ethics. Influential schools of thought in political philosophy are

liberalism Liberalism is a Political philosophy, political and moral philosophy based on the Individual rights, rights of the individual, liberty, consent of the governed, political equality, the right to private property, and equality before the law. ...

,

conservativism Conservatism is a cultural, social, and political philosophy and ideology that seeks to promote and preserve traditional institutions, customs, and values. The central tenets of conservatism may vary in relation to the culture and civilizati ...

,

socialism Socialism is an economic ideology, economic and political philosophy encompassing diverse Economic system, economic and social systems characterised by social ownership of the means of production, as opposed to private ownership. It describes ...

, and

anarchism Anarchism is a political philosophy and Political movement, movement that seeks to abolish all institutions that perpetuate authority, coercion, or Social hierarchy, hierarchy, primarily targeting the state (polity), state and capitalism. A ...

.

Methods

Methods of philosophy are ways of conducting philosophical inquiry. They include techniques for arriving at philosophical knowledge and justifying philosophical claims as well as principles used for choosing between competing theories. A great variety of methods have been employed throughout the history of philosophy. Many of them differ significantly from the methods used in the

natural sciences Natural science or empirical science is one of the branches of science concerned with the description, understanding and prediction of natural phenomena, based on empirical evidence from observation and experimentation. Mechanisms such as peer ...

in that they do not use experimental data obtained through measuring equipment. The choice of one's method usually has important implications both for how philosophical theories are constructed and for the arguments cited for or against them. This choice is often guided by epistemological considerations about what constitutes philosophical

evidence Evidence for a proposition is what supports the proposition. It is usually understood as an indication that the proposition is truth, true. The exact definition and role of evidence vary across different fields. In epistemology, evidence is what J ...

. Methodological disagreements can cause conflicts among philosophical theories or about the answers to philosophical questions. The discovery of new methods has often had important consequences both for how philosophers conduct their research and for what claims they defend. Some philosophers engage in most of their theorizing using one particular method while others employ a wider range of methods based on which one fits the specific problem investigated best. Conceptual analysis is a common method in analytic philosophy. It aims to clarify the meaning of concepts by analyzing them into their component parts. Another method often employed in analytic philosophy is based on

common sense Common sense () is "knowledge, judgement, and taste which is more or less universal and which is held more or less without reflection or argument". As such, it is often considered to represent the basic level of sound practical judgement or know ...

. It starts with commonly accepted beliefs and tries to draw unexpected conclusions from them, which it often employs in a negative sense to criticize philosophical theories that are too far removed from how the average person sees the issue. It is similar to how

ordinary language philosophy Ordinary language philosophy (OLP) is a philosophical methodology that sees traditional philosophical problems as rooted in misunderstandings philosophers develop by distorting or forgetting how words are ordinarily used to convey meaning in ...

approaches philosophical questions by investigating how ordinary language is used. Trolley Problem

Various methods in philosophy give particular importance to

intuition Intuition is the ability to acquire knowledge without recourse to conscious reasoning or needing an explanation. Different fields use the word "intuition" in very different ways, including but not limited to: direct access to unconscious knowledg ...

s, that is, non-inferential impressions about the correctness of specific claims or general principles. For example, they play an important role in

thought experiment A thought experiment is an imaginary scenario that is meant to elucidate or test an argument or theory. It is often an experiment that would be hard, impossible, or unethical to actually perform. It can also be an abstract hypothetical that is ...

s, which employ counterfactual thinking to evaluate the possible consequences of an imagined situation. These anticipated consequences can then be used to confirm or refute philosophical theories. The method of

reflective equilibrium Reflective equilibrium is a state of Balance (metaphysics), balance or coherence among a set of beliefs arrived at by a process of deliberative mutual adjustment among general principles and particular judgements. Although he did not use the term ...

also employs intuitions. It seeks to form a

coherent Coherence is, in general, a state or situation in which all the parts or ideas fit together well so that they form a united whole. More specifically, coherence, coherency, or coherent may refer to the following: Physics * Coherence (physics ...

position on a certain issue by examining all the relevant beliefs and intuitions, some of which often have to be deemphasized or reformulated to arrive at a coherent perspective. Pragmatists stress the significance of concrete practical consequences for assessing whether a philosophical theory is true. According to the pragmatic maxim as formulated by

Charles Sanders Peirce Charles Sanders Peirce ( ; September 10, 1839 – April 19, 1914) was an American scientist, mathematician, logician, and philosopher who is sometimes known as "the father of pragmatism". According to philosopher Paul Weiss (philosopher), Paul ...

, the idea a person has of an object is nothing more than the totality of practical consequences they associate with this object. Pragmatists have also used this method to expose disagreements as merely verbal, that is, to show they make no genuine difference on the level of consequences. Phenomenologists seek knowledge of the realm of appearance and the structure of human experience. They insist upon the first-personal character of all experience and proceed by suspending theoretical judgments about the external world. This technique of phenomenological reduction is known as "bracketing" or

epoché In Hellenistic philosophy, epoché (also epoche; pronounced or ; ) is suspension of judgment but also "withholding of assent". Pyrrhonism Epoché plays an important role in Pyrrhonism, the skeptical philosophy named after Pyrrho, who is ...

. The goal is to give an unbiased description of the appearance of things.

Methodological naturalism In philosophy, naturalism is the idea that only natural laws and forces (as opposed to supernatural ones) operate in the universe. In its primary sense, it is also known as ontological naturalism, metaphysical naturalism, pure naturalism, phi ...

places great emphasis on the empirical approach and the resulting theories found in the natural sciences. In this way, it contrasts with methodologies that give more weight to pure reasoning and introspection.

Relation to other fields

Philosophy is closely related to many other fields. It is sometimes understood as a meta-discipline that clarifies their nature and limits. It does this by critically examining their basic concepts, background assumptions, and methods. In this regard, it plays a key role in providing an

interdisciplinary Interdisciplinarity or interdisciplinary studies involves the combination of multiple academic disciplines into one activity (e.g., a research project). It draws knowledge from several fields such as sociology, anthropology, psychology, economi ...

perspective. It bridges the gap between different disciplines by analyzing which concepts and problems they have in common. It shows how they overlap while also delimiting their scope. Historically, most of the individual sciences originated from philosophy. The influence of philosophy is felt in several fields that require difficult practical decisions. In

medicine Medicine is the science and Praxis (process), practice of caring for patients, managing the Medical diagnosis, diagnosis, prognosis, Preventive medicine, prevention, therapy, treatment, Palliative care, palliation of their injury or disease, ...

, philosophical considerations related to

bioethics Bioethics is both a field of study and professional practice, interested in ethical issues related to health (primarily focused on the human, but also increasingly includes animal ethics), including those emerging from advances in biology, me ...

affect issues like whether an

embryo An embryo ( ) is the initial stage of development for a multicellular organism. In organisms that reproduce sexually, embryonic development is the part of the life cycle that begins just after fertilization of the female egg cell by the male sp ...

is already a

person A person (: people or persons, depending on context) is a being who has certain capacities or attributes such as reason, morality, consciousness or self-consciousness, and being a part of a culturally established form of social relations suc ...

and under what conditions

abortion Abortion is the early termination of a pregnancy by removal or expulsion of an embryo or fetus. Abortions that occur without intervention are known as miscarriages or "spontaneous abortions", and occur in roughly 30–40% of all pregnan ...

is morally permissible. A closely related philosophical problem is how humans should treat other animals, for instance, whether it is acceptable to use non-human animals as food or for research experiments. In relation to

business Business is the practice of making one's living or making money by producing or Trade, buying and selling Product (business), products (such as goods and Service (economics), services). It is also "any activity or enterprise entered into for ...

and professional life, philosophy has contributed by providing ethical frameworks. They contain guidelines on which business practices are morally acceptable and cover the issue of

corporate social responsibility Corporate social responsibility (CSR) or corporate social impact is a form of international private business industry self-regulation, self-regulation which aims to contribute to societal goals of a philanthropy, philanthropic, activist, or chari ...

. Philosophical inquiry is relevant to many fields that are concerned with what to believe and how to arrive at evidence for one's beliefs. This is a key issue for the sciences, which have as one of their prime objectives the creation of scientific knowledge. Scientific knowledge is based on

empirical evidence Empirical evidence is evidence obtained through sense experience or experimental procedure. It is of central importance to the sciences and plays a role in various other fields, like epistemology and law. There is no general agreement on how the ...

but it is often not clear whether empirical observations are neutral or already include theoretical assumptions. A closely connected problem is whether the available evidence is sufficient to decide between competing theories. Epistemological problems in relation to the

law Law is a set of rules that are created and are enforceable by social or governmental institutions to regulate behavior, with its precise definition a matter of longstanding debate. It has been variously described as a science and as the ar ...

include what counts as evidence and how much evidence is required to find a person guilty of a crime. A related issue in

journalism Journalism is the production and distribution of reports on the interaction of events, facts, ideas, and people that are the "news of the day" and that informs society to at least some degree of accuracy. The word, a noun, applies to the journ ...

is how to ensure truth and objectivity when reporting on events. In the fields of

theology Theology is the study of religious belief from a Religion, religious perspective, with a focus on the nature of divinity. It is taught as an Discipline (academia), academic discipline, typically in universities and seminaries. It occupies itse ...

and religion, there are many doctrines associated with the existence and nature of God as well as rules governing correct behavior. A key issue is whether a rational person should believe these doctrines, for example, whether

revelation Revelation, or divine revelation, is the disclosing of some form of Religious views on truth, truth or Knowledge#Religion, knowledge through communication with a deity (god) or other supernatural entity or entities in the view of religion and t ...

in the form of holy books and

religious experience A religious experience (sometimes known as a spiritual experience, sacred experience, mystical experience) is a subjectivity, subjective experience which is interpreted within a religious framework. The concept originated in the 19th century, a ...

s of the divine are sufficient evidence for these beliefs. Philosophy in the form of logic has been influential in the fields of mathematics and

computer science Computer science is the study of computation, information, and automation. Computer science spans Theoretical computer science, theoretical disciplines (such as algorithms, theory of computation, and information theory) to Applied science, ...

. Further fields influenced by philosophy include

psychology Psychology is the scientific study of mind and behavior. Its subject matter includes the behavior of humans and nonhumans, both consciousness, conscious and Unconscious mind, unconscious phenomena, and mental processes such as thoughts, feel ...

,

sociology Sociology is the scientific study of human society that focuses on society, human social behavior, patterns of Interpersonal ties, social relationships, social interaction, and aspects of culture associated with everyday life. The term sociol ...

, linguistics,

education Education is the transmission of knowledge and skills and the development of character traits. Formal education occurs within a structured institutional framework, such as public schools, following a curriculum. Non-formal education als ...

, and

the arts The arts or creative arts are a vast range of human practices involving creative expression, storytelling, and cultural participation. The arts encompass diverse and plural modes of thought, deeds, and existence in an extensive range of m ...

. The close relation between philosophy and other fields in the contemporary period is reflected in the fact that many philosophy graduates go on to work in related fields rather than in philosophy itself. In the field of politics, philosophy addresses issues such as how to assess whether a government policy is just. Philosophical ideas have prepared and shaped various political developments. For example, ideals formulated in Enlightenment philosophy laid the foundation for

constitutional democracy A constitution is the aggregate of fundamental principles or established precedents that constitute the legal basis of a polity, organization or other type of Legal entity, entity, and commonly determines how that entity is to be governed. Wh ...

and played a role in the

American Revolution The American Revolution (1765–1783) was a colonial rebellion and war of independence in which the Thirteen Colonies broke from British America, British rule to form the United States of America. The revolution culminated in the American ...

and the French Revolution. Marxist philosophy and its exposition of communism was one of the factors in the

Russian Revolution The Russian Revolution was a period of Political revolution (Trotskyism), political and social revolution, social change in Russian Empire, Russia, starting in 1917. This period saw Russia Dissolution of the Russian Empire, abolish its mona ...

and the

Chinese Communist Revolution The Chinese Communist Revolution was a social revolution, social and political revolution in China that began in 1927 and culminated with the proclamation of the People's Republic of China (PRC) in 1949. The revolution was led by the Chinese C ...

. In India,

Mahatma Gandhi Mohandas Karamchand Gandhi (2October 186930January 1948) was an Indian lawyer, anti-colonial nationalism, anti-colonial nationalist, and political ethics, political ethicist who employed nonviolent resistance to lead the successful Indian ...

's philosophy of non-violence shaped the

Indian independence movement The Indian independence movement was a series of historic events in South Asia with the ultimate aim of ending British Raj, British colonial rule. It lasted until 1947, when the Indian Independence Act 1947 was passed. The first nationalistic ...

. An example of the cultural and critical role of philosophy is found in its influence on the

feminist Feminism is a range of socio-political movements and ideology, ideologies that aim to define and establish the political, economic, personal, and social gender equality, equality of the sexes. Feminism holds the position that modern soci ...

movement through philosophers such as

Mary Wollstonecraft Mary Wollstonecraft ( , ; 27 April 175910 September 1797) was an English writer and philosopher best known for her advocacy of women's rights. Until the late 20th century, Wollstonecraft's life, which encompassed several unconventional ...

,

Simone de Beauvoir Simone Lucie Ernestine Marie Bertrand de Beauvoir (, ; ; 9 January 1908 – 14 April 1986) was a French existentialist philosopher, writer, social theorist, and feminist activist. Though she did not consider herself a philosopher, nor was she ...

, and

Judith Butler Judith Pamela Butler (born February 24, 1956) is an American feminist philosopher and gender studies scholar whose work has influenced political philosophy, ethics, and the fields of third-wave feminism, queer theory, and literary theory. In ...

. It has shaped the understanding of key concepts in feminism, for instance, the meaning of

gender Gender is the range of social, psychological, cultural, and behavioral aspects of being a man (or boy), woman (or girl), or third gender. Although gender often corresponds to sex, a transgender person may identify with a gender other tha ...

, how it differs from biological sex, and what role it plays in the formation of

personal identity Personal identity is the unique numerical identity of a person over time. Discussions regarding personal identity typically aim to determine the necessary and sufficient conditions under which a person at one time and a person at another time ...

. Philosophers have also investigated the concepts of justice and equality and their implications with respect to the prejudicial treatment of women in male-dominated societies. The idea that philosophy is useful for many aspects of life and society is sometimes rejected. According to one such view, philosophy is mainly undertaken for its own sake and does not make significant contributions to existing practices or external goals.

References

Notes

Citations

Bibliography

* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * (for an earlier version, see: ) * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *

External links

''Internet Encyclopedia of Philosophy''
– a peer-reviewed online encyclopedia of philosophy
''Stanford Encyclopedia of Philosophy''
– an online encyclopedia of philosophy maintained by

Stanford University Leland Stanford Junior University, commonly referred to as Stanford University, is a Private university, private research university in Stanford, California, United States. It was founded in 1885 by railroad magnate Leland Stanford (the eighth ...

PhilPapers
– a comprehensive directory of online philosophical articles and books by academic philosophers
Internet Philosophy Ontology Project
– a model of relationships between philosophical ideas, thinkers, and journals {{Authority control