TheInfoList

A belief is an
attitude Attitude may refer to: Philosophy and psychology * Attitude (psychology) In psychology Psychology is the science of mind and behavior. Psychology includes the study of consciousness, conscious and Unconscious mind, unconscious phenome ...
that something is the case, or that some
proposition In logic and linguistics, a proposition is the meaning of a declarative sentence (linguistics), sentence. In philosophy, "Meaning (philosophy), meaning" is understood to be a non-linguistic entity which is shared by all sentences with the same mea ...
true True most commonly refers to truth Truth is the property of being in accord with fact or reality.Merriam-Webster's Online Dictionarytruth 2005 In everyday language, truth is typically ascribed to things that aim to represent reality or otherw ...

. In
epistemology Epistemology (; ) is the Outline of philosophy, branch of philosophy concerned with knowledge. Epistemologists study the nature, origin, and scope of knowledge, epistemic Justification (epistemology), justification, the Reason, rationality of ...

, philosophers use the term "belief" to refer to attitudes about the world which can be either true or false. To believe something is to take it to be true; for instance, to believe that snow is white is comparable to accepting the truth of the
proposition In logic and linguistics, a proposition is the meaning of a declarative sentence (linguistics), sentence. In philosophy, "Meaning (philosophy), meaning" is understood to be a non-linguistic entity which is shared by all sentences with the same mea ...
"snow is white". However, holding a belief does not require active
introspection Introspection is the examination of one's own conscious , an English Paracelsian physician Consciousness, at its simplest, is " sentience or awareness of internal and external existence". Despite millennia of analyses, definitions, explanatio ...
. For example, few carefully consider whether or not the sun will rise tomorrow, simply assuming that it will. Moreover, beliefs need not be ''occurrent'' (e.g. a person actively thinking "snow is white"), but can instead be ''dispositional'' (e.g. a person who if asked about the color of snow would assert "snow is white"). There are various different ways that contemporary
philosopher A philosopher is someone who practices philosophy. The term ''philosopher'' comes from the grc, φιλόσοφος, , translit=philosophos, meaning 'lover of wisdom'. The coining of the term has been attributed to the Greek thinker Pythagoras ( ...

s have tried to describe beliefs, including as representations of ways that the world could be (), as dispositions to act as if certain things are true (
Roderick Chisholm Roderick Milton Chisholm (; November 27, 1916 – January 19, 1999) was an American philosopher known for his work on epistemology Epistemology (; ) is the Outline of philosophy, branch of philosophy concerned with knowledge. Epistemologist ...
), as interpretive schemes for making sense of someone's actions (
Daniel Dennett Daniel Clement Dennett III (born March 28, 1942) is an American philosopher A philosopher is someone who practices philosophy. The term ''philosopher'' comes from the grc, φιλόσοφος, , translit=philosophos, meaning 'lover of wisdom' ...
and Donald Davidson), or as mental states that fill a particular function (
Hilary Putnam Hilary Whitehall Putnam (; July 31, 1926 – March 13, 2016) was an American philosopher A philosopher is someone who practices philosophy. The term ''philosopher'' comes from the grc, φιλόσοφος, , translit=philosophos, meaning 'love ...

). Some have also attempted to offer significant revisions to our notion of belief, including eliminativists about belief who argue that there is no phenomenon in the natural world which corresponds to our folk psychological concept of belief (
Paul Churchland Paul Montgomery Churchland (born October 21, 1942) is a Canadian philosopher known for his studies in neurophilosophy and the philosophy of mind. After earning a Ph.D. from the University of Pittsburgh under Wilfrid Sellars (1969), Churchland rose ...
) and formal epistemologists who aim to replace our bivalent notion of belief ("either we have a belief or we don't have a belief") with the more permissive, probabilistic notion of credence ("there is an entire spectrum of degrees of belief, not a simple dichotomy between belief and non-belief"). Beliefs are the subject of various important philosophical debates. Notable examples include: "What is the rational way to revise one's beliefs when presented with various sorts of evidence?"; "Is the content of our beliefs entirely determined by our mental states, or do the relevant facts have any bearing on our beliefs (e.g. if I believe that I'm holding a glass of water, is the non-mental fact that water is H2O part of the content of that belief)?"; "How fine-grained or coarse-grained are our beliefs?"; and "Must it be possible for a belief to be expressible in language, or are there non-linguistic beliefs?".

# Conceptions

Various conceptions of the essential features of beliefs have been proposed but there is no consensus as to which is the right one. ''Representationalism'' is the traditionally dominant position. In its most common form, it holds that beliefs are mental attitudes towards representations, which are usually identified with propositions. These attitudes are part of the internal constitution of the mind holding the attitude. This view contrasts with ''functionalism'', which defines beliefs not in terms of the internal constitution of the mind but in terms of the function or the causal role played by beliefs. According to ''dispositionalism'', beliefs are identified with dispositions to behave in certain ways. This view can be seen as a form of functionalism defining beliefs in terms of the behavior they tend to cause. ''Interpretationism'' constitutes another conception, which has gained popularity in contemporary philosophy. It holds that the beliefs of an entity are in some sense dependent on or relative to the interpretation of a third party of this entity. ''Representationalism'' tends to be associated with a mind-body-dualism. ''Naturalist'' considerations against this dualism are one of the motivations for choosing one of the alternative conceptions.

## Representationalism

Representationalism characterizes beliefs in terms of
mental representation A mental representation (or cognitive representation), in philosophy of mind Philosophy of mind is a branch of philosophy that studies the ontology and nature of the mind and its relationship with the body. The mind–body problem is a paradigm ...
s. Representations are usually defined as objects with
semantic properties Semantic properties or meaning properties are those aspects of a linguistic unit, such as a morpheme A morpheme is the smallest meaningful unit in a language. A morpheme is not necessarily the same as a word. The main difference between a morphe ...
, like having a content, referring to something, being true or false, etc. Beliefs form a special class of mental representations since they do not involve sensory qualities in order to represent something, unlike perceptions or episodic memories. Because of this, it seems natural to construe beliefs as attitudes towards propositions, which also constitute non-sensory representations, i.e. as
propositional attitudes A propositional attitude is a mental state held by an agent toward a proposition In linguistics and logic, a proposition is the meaning of a declarative sentence. In philosophy, "Meaning (philosophy), meaning" is understood to be a non-linguisti ...
. As
mental attitude In psychology Psychology is the science of mind and behavior. Psychology includes the study of consciousness, conscious and Unconscious mind, unconscious phenomena, as well as feeling and thought. It is an academic discipline of immense sc ...
s, beliefs are characterized both by their content and their mode. The content of an attitude is what this attitude is directed at: its object. Propositional attitudes are directed at propositions. Beliefs are usually distinguished from other propositional attitudes, like desires, by their mode or the way how they are directed at propositions. The mode of beliefs has a mind-to-world
direction of fit The technical term direction of fit is used to describe the distinctions that are offered by two related sets of opposing terms: * The more general set of mind-to-world (i.e., mind-to-fit-world, not from-mind-to-world) ''vs.'' world-to-mind (i.e., w ...
: beliefs try to represent the world as it is, they do not intend to change it, unlike desires. For example, on this outlook, if Rahul believes that it will be sunny today, then he has a mental attitude towards the proposition "It will be sunny today" which affirms that this proposition is true. This is different from Sofía's desire that it will be sunny today, despite the fact that both Rahul and Sofía have attitudes toward the same proposition. The mind-to-world direction of fit of beliefs is sometimes expressed by saying that beliefs aim at truth. This aim is also reflected in the tendency to revise one's belief upon receiving new evidence that an old belief is false. So upon hearing the bad weather forecast, Rahul is likely to change his mental attitude but Sofía is not. There are different ways of conceiving how mental representations are realized in the mind. One form is the
language of thought hypothesisThe language of thought hypothesis (LOTH), sometimes known as thought ordered mental expression (TOME), is a view in linguistics Linguistics is the science, scientific study of language. It encompasses the analysis of every aspect of language, ...
, which claims that mental representations have a language-like structure, sometimes referred to as ''mentalese''. Just like regular language, this involves simple elements that are combined in various ways according to syntactic rules to form more complex elements that act as bearers of meaning. On this conception, holding a belief would involve storing such a complex element in one's mind. Different beliefs are separated from each other in that they correspond to different elements stored in the mind. A more holistic alternative to the ''language of thought hypothesis'' is the map-conception, which uses the analogy to maps to elucidate the nature of beliefs. According to this view, the belief-system of a mind should not be conceived as a set of many individual sentences but as a map encoding the information contained in these sentences. For example, the fact that Brussels is halfway between Paris and Amsterdam can be expressed both linguistically as a sentence and in a map through its internal geometrical relations.

## Functionalism

Functionalism contrasts with representationalism in that it defines beliefs not in terms of the internal constitution of the mind but in terms of the function or the causal role played by them. This view is often combined with the idea that the same belief can be realized in various ways and that it does not matter how it is realized as long as it plays the causal role characteristic to it. As an analogy, a
hard drive A hard disk drive (HDD), hard disk, hard drive, or fixed disk is an electro-mechanical data storage device File:Reel-to-reel recorder tc-630.jpg, On a reel-to-reel tape recorder (Sony TC-630), the recorder is data storage equipment an ...
is defined in a functionalist manner: it performs the function of storing and retrieving digital data. This function can be realized in many different ways: being made of plastic or steel, using magnetic tape or laser. Functionalists hold that something similar is true for beliefs (or mental states in general). Among the roles relevant for beliefs is their relation to perceptions and to actions: perceptions usually cause beliefs and beliefs cause actions. For example, seeing that the traffic light has switched to red is usually associated with the belief that it is red, which in turn causes the driver to bring the car to a halt. Functionalists use such characteristics to define beliefs: whatever is caused by perceptions in a certain way and also causes behavior in a certain way is called a belief. This is not just true for humans but may include animals, hypothetical aliens or even computers. From this perspective, it would make sense to ascribe the belief that the traffic light is red to a
self-driving car A self-driving car, also known as an autonomous vehicle (AV or auto), driverless car, or robo-car is a vehicle A vehicle (from la, vehiculum) is a machine that transport Transport (commonly used in the U.K.), or transportation (use ...
behaving just like the human driver. ''Dispositionalism'' is sometimes seen as a specific form of functionalism. It defines beliefs only concerning their role as causes of behavior or as
dispositions A disposition is a quality of character, a habit A habit (or wont as a humorous and formal term) is a routine of behavior Behavior (American English) or behaviour (British English; American and British English spelling differences#-our, -or, ...
to behave in a certain way. For example, a belief that there is a pie in the pantry is associated with the disposition to affirm this when asked and to go to the pantry when hungry. While it is uncontroversial that beliefs shape our behavior, the thesis that beliefs can be defined exclusively through their role in producing behavior has been contested. The problem arises because the mechanisms shaping our behavior seem to be too complex to single out the general contribution of one particular belief for any possible situation. For example, one may decide not to affirm that there is a pie in the pantry when asked because one wants to keep it secret. Or one may not eat the pie despite being hungry because one also believes that it is poisoned. Due to this complexity, we are unable to define even a belief as simple as this one in terms of the behavioral dispositions for which it is responsible.

## Interpretationism

According to ''interpretationism'', the beliefs of an entity are in some sense dependent on or relative to the interpretation of a third party of this entity.
Daniel Dennett Daniel Clement Dennett III (born March 28, 1942) is an American philosopher A philosopher is someone who practices philosophy. The term ''philosopher'' comes from the grc, φιλόσοφος, , translit=philosophos, meaning 'lover of wisdom' ...
is an important defender of such a position. He holds that we ascribe beliefs to entities in order to predict how they will behave. Entities with simple behavioral patterns can be described using physical laws or in terms of their function. Dennett refers to these forms of explanation as the ''physical stance'' and the ''design stance''. These stances are contrasted with the ''
intentional stanceThe intentional stance is a term coined by philosopher A philosopher is someone who practices philosophy. The term ''philosopher'' comes from the grc, φιλόσοφος, , translit=philosophos, meaning 'lover of wisdom'. The coining of the term ...
'', which is applied to entities with a more complex behavior by ascribing beliefs and desires to these entities. For example, we can predict that a chess player will move her queen to f7 if we ascribe to her the desire to win the game and the belief that this move will achieve that. The same procedure can also be applied to predicting how a chess computer will behave. The entity has the belief in question if this belief can be used to predict its behavior. Having a belief is relative to an interpretation since there may be different equally good ways of ascribing beliefs to predict behavior. So there may be another interpretation that predicts the move of the queen to f7 that does not involve the belief that this move will win the game. Another version of ''interpretationism'' is due to Donald Davidson, who uses the thought experiment of
radical interpretationRadical interpretation is interpretation of a speaker, including attributing beliefs and desires to them and meanings to their words, from scratch—that is, without relying on translators, dictionaries, or specific prior knowledge of their mental st ...
, in which the goal is to make sense of the behavior and language of another person from scratch without any knowledge of this person's language. This process involves ascribing beliefs and desires to the speaker. The speaker really has these beliefs if this project can be successful in principle. Interpretationism can be combined with ''eliminativism'' and ''instrumentalism'' about beliefs. Eliminativists hold that, strictly speaking, there are no beliefs. Instrumentalists agree with eliminativists but add that belief-ascriptions are useful nonetheless. This usefulness can be explained in terms of interpretationism: belief-ascriptions help us in predicting how entities will behave. It has been argued that interpretationism can also be understood in a more realistic sense: that entities really have the beliefs ascribed to them and that these beliefs participate in the causal network. But for this to be possible, it may be necessary to define interpretivism as a methodology and not as an ontological outlook on beliefs.

## Historical

In the context of Ancient Greek thought, three related concepts were identified regarding the concept of belief: ''
pistisIn Greek mythology Greek mythology is the body of myths originally told by the Ancient Greece, ancient Greeks, and a genre of Ancient Greek folklore. These stories concern the Cosmogony, origin and Cosmology#Metaphysical cosmology, nature of the ...
,'' ''
doxa Doxa (; from verb ) Liddell, Henry George, and Robert Scott. 1940.δοκέω" In '' A Greek-English Lexicon'', edited by H. S. Jones and R. McKenzie. Oxford. Clarendon Press Oxford University Press (OUP) is the university press 200px, The P ...
,'' and ''
dogma Dogma in the broad sense is any belief held unquestioningly and with undefended certainty. It may be in the form of an official system of principles A principle is a proposition or value that is a guide for behavior or evaluation. In law, it ...
.'' Simplified, ''pistis'' refers to " trust" and "confidence," ''doxa'' refers to "
opinion An opinion is a judgement, viewpoint, or Proposition, statement that is not conclusive, rather than facts, which are true statements. Definition A given opinion may deal with subjectivity, subjective matters in which there is no conclusive findi ...

" and "acceptance," and ''dogma'' refers to the positions of a philosopher or of a philosophical school such as
Stoicism Stoicism is a school of Hellenistic philosophy founded by Zeno of Citium in Athens in the early 3rd century BC. It is a philosophy of personal eudemonic virtue ethics informed by its system of logic and its views on the natural world, asserting ...
.

# Types

Beliefs can be categorized into various types depending on their ontological status, their degree, their object or their semantic properties.

## Occurrent and dispositional

Having an occurrent belief that
Ayers Rock Uluru (, pjt, Uluṟu ), also known as Ayers Rock (, like ''airs'') and officially gazetted as UluruAyers Rock, is a large sandstone rock formation in the southern part of the Northern Territory in Australia Australia, officially ...

is in Australia involves entertaining the representation associated with this belief, for example, by actively thinking about it. But the great majority of our beliefs are not active most of the time, they are merely dispositional. They usually become activated or occurrent when needed or relevant in some way and then fall back into their dispositional state afterward. For example, the belief that 57 is greater than 14 was probably dispositional to the reader before reading this sentence, has become occurrent while reading it and may soon become dispositional again as the mind focuses elsewhere. The distinction between occurrent and dispositional beliefs is sometimes identified with the distinction between conscious and unconscious beliefs. But it has been argued that despite overlapping, the two distinctions do not match. The reason for this is that beliefs can shape one's behavior and be involved in one's reasoning even if the subject is not conscious of them. Such beliefs are cases of unconscious occurrent mental states. On this view, being occurrent corresponds to being active, either consciously or unconsciously. A dispositional belief is not the same as a disposition to believe. We have various dispositions to believe given the right perceptions, for example, to believe that it is raining given the perception of rain. Without this perception, there is still a disposition to believe but no actual dispositional belief. On a dispositionalist conception of beliefs, there are no occurrent beliefs since all beliefs are defined in terms of dispositions.

## Full and partial

An important dispute in formal epistemology concerns the question of whether beliefs should be conceptualized as full beliefs or as partial beliefs. Full beliefs are all-or-nothing attitudes: either one has a belief in a proposition or one does not. This conception is sufficient to understand many belief ascriptions found in everyday language, for example, Pedro's belief that the earth is bigger than the moon. But some cases involving comparisons between beliefs are not easily captured through full beliefs alone, for example, that Pedro's belief that the earth is bigger than the moon is more certain than his belief that the earth is bigger than Venus. Such cases are most naturally analyzed in terms of partial beliefs involving degrees of belief, so-called credences. The higher the degree of a belief, the more certain the believer is that the believed proposition is true. This is usually formalized by numbers between 0 and 1: a degree of 1 represents an absolutely certain belief, a belief of 0 corresponds to an absolutely certain disbelief and all the numbers in between correspond to intermediate degrees of certainty. In the Bayesian approach, these degrees are interpreted as
subjective probabilities Bayesian probability is an interpretation of the concept of probability, in which, instead of frequency Frequency is the number of occurrences of a repeating event per unit of time. It is also referred to as temporal frequency, which emphasize ...
, e.g. a belief of degree 0.9 that it will rain tomorrow means that the agent thinks that the probability of rain tomorrow is 90 %. Bayesianism uses this relation between beliefs and probability to define the norms of rationality in terms of the laws of probability. This includes both synchronic laws about what one should believe at any moment and diachronic laws about how one should revise one's beliefs upon receiving new evidence. The central question in the dispute between full and partial beliefs is whether these two types are really distinct types or whether one type can be explained in terms of the other type. One answer to this question is called the ''Lockean thesis''. It states that partial beliefs are basic and that full beliefs are to be conceived as partial beliefs above a certain threshold, for example, that every belief above 0.9 is a full belief. Defenders of a primitive notion of full belief, on the other hand, have tried to explain partial beliefs as full beliefs about probabilities. On this view, having a partial belief of degree 0.9 that it will rain tomorrow is the same as having a full belief that the probability of rain tomorrow is 90 %. Another approach circumvents the notion of probability alltogether and replaces degrees of belief with degrees of disposition to revise one's full belief. From this perspective, both a belief of degree 0.6 and a belief of degree 0.9 may be seen as full beliefs. The difference between them is that the former belief can easily be changed upon receiving new evidence while the ladder is more stable.

## Belief-in and belief-that

Traditionally, philosophers have mainly focused in their inquiries concerning belief on the notion of belief-that. Belief-that can be characterized as a
propositional attitude A propositional attitude is a mental state held by an agent toward a proposition In linguistics and logic, a proposition is the meaning of a declarative sentence. In philosophy, "Meaning (philosophy), meaning" is understood to be a non-linguisti ...
to a claim which is either true or false. Belief-in, on the other hand, is more closely related to notions like trust or faith in that it refers usually to an attitude to persons. ''Belief-in'' plays a central role in many religious traditions in which ''belief in God'' is one of the central virtues of their followers. The difference between belief-in and belief-that is sometimes blurry since various expressions using the term "belief in" seem to be translatable into corresponding expressions using the term "belief that" instead. For example, a ''belief in'' fairies may be said to be a ''belief that'' fairies exist. In this sense, belief-in is often used when the entity is not real, or its existence is in doubt. Typical examples would include: "he believes in witches and ghosts" or "many children believe in
Santa Claus Santa Claus, also known as Father Christmas, Saint Nicholas, Saint Nick, Kris Kringle, or simply Santa, is a legendary character Character(s) may refer to: Arts, entertainment, and media Literature * ''Character'' (novel), a 1936 Dutch ...

" or "I believe in a deity". Not all usages of belief-in concern the existence of something: some are ''commendatory'' in that they express a positive attitude towards their object. It has been suggested that these cases can also be accounted for in terms of belief-that. For example, a ''belief in'' marriage could be translated as a ''belief that'' marriage is good. Belief-in is used in a similar sense when expressing
self-confidence Confidence is a state of being clear-headed either that a hypothesis or prediction is correct or that a chosen course of action is the best or most effective. Confidence comes from a Latin word 'fidere' which means "to trust"; therefore, having ...
or faith in one's self or one's abilities. Defenders of a reductive account of belief-in have used this line of thought to argue that ''belief in God'' can be analyzed in a similar way, e.g. that it amounts to a belief that God exists with his characteristic attributes, like
omniscience Omniscience () is the capacity to know KNOW-FM (91.1 FM) is the flagship A flagship is a vessel used by the commanding officer of a group of naval ships, characteristically a flag officer A flag officer is a commissioned officer in ...

and
omnipotence '' Michelangelo.html"_;"title="Separation_of_Light_from_Darkness''_by_Michelangelo">Separation_of_Light_from_Darkness''_by_Michelangelo_ Omnipotence_is_the_quality_of_having_unlimited_power_and_potential._Monotheism.html" ;"title="Michelangelo_.ht ...
. Opponents of this account often concede that belief-in may entail various forms of belief-that but that there are additional aspects to belief-in that are not reducible to belief-that. For example, a ''belief in'' an ideal may involve the ''belief that'' this ideal is something good, but it additionally involves a positive evaluative attitude toward this ideal that goes beyond a mere propositional attitude. Applied to the ''belief in'' God, opponents of the reductive approach may hold that a ''belief that'' God exists may be a necessary pre-condition for ''belief in'' God, but that it is not sufficient.

## De dicto and de re

The difference between
de dicto and de re ''De dicto'' and ''de re'' are two phrases used to mark a distinction in intensional statements, associated with the intensional operators in many such statements. The distinction is used regularly in metaphysics Metaphysics is the branch of p ...
beliefs or the corresponding ascriptions concerns the contributions singular terms like names and other referential devices make to the semantic properties of the belief or its ascription. In regular contexts, the truth-value of a sentence does not change upon substitution of co-referring terms. For example, since the names "Superman" and "Clark Kent" refer to the same person, we can replace one with the other in the sentence "Superman is strong" without changing its truth-value. But this issue is more complicated in case of belief ascriptions. For example, Lois believes that Superman is strong but she does not believe that Clark Kent is strong. This difficulty arises due to the fact that she does not know that the two names refer to the same entity. Beliefs or belief ascriptions for which this substitution does not generally work are ''de dicto'', otherwise, they are ''de re''. So in a de re sense, Lois does believe that Clark Kent is strong, while in a de dicto sense she does not. The contexts corresponding to ''de dicto'' ascriptions are known as referentially opaque contexts while ''de re'' ascriptions are ''referentially transparent''.

## Collective belief

A collective belief is referred to when people speak of what "we" believe when this is not simply elliptical for what "we all" believe. Sociologist
Émile Durkheim David Émile Durkheim ( or ; 15 April 1858 – 15 November 1917) was a French Sociology, sociologist. He formally established the academic discipline of sociology and, with Max Weber, is commonly cited as the principal architect of modern social ...

wrote of collective beliefs and proposed that they, like all "
social fact In sociology Sociology is the study of society, human social behaviour, patterns of social relationships, social interaction, and culture that surrounds everyday life. It is a social science that uses various methods of Empirical method, empir ...
s", "inhered in" social
groups A group is a number of people or things that are located, gathered, or classed together. Groups of people * Cultural group, a group whose members share the same cultural identity * Ethnic group, a group whose members share the same ethnic identi ...
as opposed to individual persons.
Jonathan Dancy Jonathan Peter Dancy (born 8 May 1946) is a British philosopher, who has written on ethics Ethics or moral philosophy is a branch of philosophy that "involves systematizing, defending, and recommending concepts of right and wrong action (philos ...
states that "Durkheim's discussion of collective belief, though suggestive, is relatively obscure".
Philosopher A philosopher is someone who practices philosophy. The term ''philosopher'' comes from the grc, φιλόσοφος, , translit=philosophos, meaning 'lover of wisdom'. The coining of the term has been attributed to the Greek thinker Pythagoras ( ...

Margaret Gilbert Margaret Gilbert (born 1942) is a British philosopher best known for her founding contributions to the analytic philosophy of social phenomena. She has also made substantial contributions to other philosophical fields including political philosoph ...
(1942- ) has offered a related account in terms of the joint commitment of a number of persons as a body to accept a certain belief. According to this account, individuals who together collectively believe something need not personally believe it individually. Gilbert's work on the topic has stimulated a developing literature among philosophers. One question that has arisen is whether and how philosophical accounts of belief in general need to be sensitive to the possibility of collective belief.

# Belief contents

As
mental representation A mental representation (or cognitive representation), in philosophy of mind Philosophy of mind is a branch of philosophy that studies the ontology and nature of the mind and its relationship with the body. The mind–body problem is a paradigm ...
s, beliefs have contents. The content of a belief is what this belief is about or what it represents. Within philosophy, there are various disputes about how the contents of beliefs are to be understood. Holists and molecularists hold that the content of one particular belief depends on or is determined by other beliefs belonging to the same subject, which is denied by atomists. The question of dependence or determination also plays a central role in the internalism-externalism-debate. Internalism states that the contents of someone's beliefs depend only on what is internal to that person: they are determined entirely by things going on inside this person's head. Externalism, on the other hand, holds that the relations to one's environment also have a role to play in this.

## Atomism, molecularism and holism

The disagreement between atomism, molecularism and holism concerns the question of how the content of one belief depends on the contents of other beliefs held by the same subject. Atomists deny such dependence relations, molecularists restrict them to only a few closely related beliefs while holists hold that they may obtain between any two beliefs, however unrelated they seem. For example, assume that Mei and Benjamin both affirm that
Jupiter Jupiter is the fifth planet from the Sun and the largest in the Solar System. It is a gas giant A gas giant is a giant planet composed mainly of hydrogen Hydrogen is the chemical element with the Symbol (chemistry), symbol H and at ...

is a planet. The most straightforward explanation, given by the atomists, would be that they have the same belief, i.e. that they hold the same content to be true. But now assume that Mei also believes that
Pluto Pluto ( minor planet designation: 134340 Pluto) is a dwarf planet A dwarf planet is a planetary-mass object that does not dominate its region of space (as a planet A planet is an astronomical body orbiting a star or Stellar evoluti ...

is a planet, which is denied by Benjamin. This indicates that they have different concepts of
planet A planet is an astronomical body orbiting a star or Stellar evolution#Stellar remnants, stellar remnant that is massive enough to be Hydrostatic equilibrium, rounded by its own gravity, is not massive enough to cause thermonuclear fusion, and ...

, which would mean that they were affirming different contents when they both agreed that Jupiter is a planet. This reasoning leads to molecularism or holism because the content of the Jupiter-belief depends on the Pluto-belief in this example. An important motivation for this position comes from W. V. Quine's confirmational holism, which holds that, because of this interconnectedness, we cannot confirm or disconfirm individual hypotheses, that confirmation happens on the level of the theory as a whole. Another motivation is due to considerations of the nature of learning: it is often not possible to understand one concept, like
force In physics Physics is the natural science that studies matter, its Elementary particle, fundamental constituents, its Motion (physics), motion and behavior through Spacetime, space and time, and the related entities of energy and force ...

in Newtonian physics, without understanding other concepts, like
mass Mass is the physical quantity, quantity of ''matter'' in a physical body. It is also a measure (mathematics), measure of the body's ''inertia'', the resistance to acceleration (change of velocity) when a net force is applied. An object's mass ...
or
kinetic energy In physics, the kinetic energy of an object is the energy that it possesses due to its motion (physics), motion. It is defined as the work (physics), work needed to accelerate a body of a given mass from rest to its stated velocity. Having gaine ...
. One problem for holism is that genuine disagreements seem to be impossible or very rare: disputants would usually talk past each other since they never share exactly the same web of beliefs needed to determine the content of the source of the disagreement.

## Internalism and externalism

Internalism and externalism disagree about whether the contents of our beliefs are determined only by what's happening in our head or also by other factors. Internalists deny such a dependence on external factors. They hold that a person and a molecule-by-molecule copy would have exactly the same beliefs.
Hilary Putnam Hilary Whitehall Putnam (; July 31, 1926 – March 13, 2016) was an American philosopher A philosopher is someone who practices philosophy. The term ''philosopher'' comes from the grc, φιλόσοφος, , translit=philosophos, meaning 'love ...

objects to this position by way of his
twin Earth thought experiment Twin Earth is a thought experiment A thought experiment is a hypothetical situation in which a hypothesis, theory A theory is a reason, rational type of abstraction, abstract thinking about a phenomenon, or the results of such thinking. The proc ...
. He imagines a twin Earth in another part of the universe that is exactly like ours, except that their water has a different chemical composition despite behaving just like ours. According to Putnam, the reader's thought that water is wet is about ''our water'' while the reader's twin's thought on twin Earth that water is wet is about ''their water''. This is the case despite the fact that the two readers have the same molecular composition. So it seems necessary to include external factors in order to explain the difference. One problem with this position is that this difference in content does not bring any causal difference with it: the two readers act in exactly the same way. This casts doubt on the thesis that there is any genuine difference in need of explanation between the contents of the two beliefs.

# Epistemology

Epistemology is concerned with delineating the boundary between justified belief and
opinion An opinion is a judgement, viewpoint, or Proposition, statement that is not conclusive, rather than facts, which are true statements. Definition A given opinion may deal with subjectivity, subjective matters in which there is no conclusive findi ...

, and involved generally with a theoretical
philosophical Philosophy (from , ) is the study of general and fundamental questions, such as those about existence Existence is the ability of an entity to interact with physical or mental reality Reality is the sum or aggregate of all that is real o ...

study of
knowledge Knowledge is a familiarity or awareness, of someone or something, such as facts A fact is an occurrence in the real world. The usual test for a statement of fact is verifiability—that is whether it can be demonstrated to correspond to exp ...
. The primary problem in epistemology is to understand what is needed to have knowledge. In a notion derived from
Plato Plato ( ; grc-gre, Πλάτων ; 428/427 or 424/423 – 348/347 BC) was an Athenian , image_skyline = File:Athens Montage L.png, center, 275px, alt=Athens montage. Clicking on an image in the picture causes the ...

's dialogue '' Theaetetus'', where the epistemology of
Socrates Socrates (; grc, Σωκράτης ''Sōkrátēs'' ; – 399 BC) was a Greek philosopher from Classical Athens, Athens who is credited as one of the founders of Western philosophy, and as being the first moral philosopher of the Virtu ...

most clearly departs from that of the
sophist A sophist ( el, σοφιστής, ''sophistes'') was a teacher in ancient Greece in the fifth and fourth centuries BC. Sophists specialized in one or more subject areas, such as philosophy, rhetoric, music, athletics, and mathematics. They taught ...
s, who appear to have defined knowledge as "
justified true belief A belief is an attitude that something is the case, or that some proposition In linguistics and logic, a proposition is the meaning of a declarative sentence. In philosophy, "Meaning (philosophy), meaning" is understood to be a non-linguist ...
". The tendency to base knowledge (''
episteme Episteme (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: Mycena ...
'') on common opinion (''
doxa Doxa (; from verb ) Liddell, Henry George, and Robert Scott. 1940.δοκέω" In '' A Greek-English Lexicon'', edited by H. S. Jones and R. McKenzie. Oxford. Clarendon Press Oxford University Press (OUP) is the university press 200px, The P ...
'') Socrates dismisses, results from failing to distinguish a
dispositive In law Law is a system A system is a group of Interaction, interacting or interrelated elements that act according to a set of rules to form a unified whole. A system, surrounded and influenced by its environment, is described by its bou ...
belief (''doxa'') from knowledge (''episteme'') when the opinion is regarded correct (n.b., ''orthé'' not '' alethia''), in terms of right, and juristically so (according to the premises of the dialogue), which was the task of the
rhetor Rhetoric () is the art Art is a diverse range of (products of) human activities involving creative imagination to express technical proficiency, beauty, emotional power, or conceptual ideas. There is no generally agreed defini ...
s to prove. Plato dismisses this possibility of an affirmative relation between opinion and knowledge even when the one who opines grounds his belief on the rule, and is able to add justification (''
logos ''Logos'' (, ; grc, wikt:λόγος, λόγος, lógos; from , , ) is a term in Western philosophy, psychology, rhetoric, and religion derived from a Greek word variously meaning "ground", "plea", "opinion", "expectation", "word", "speech", "a ...

'': reasonable and necessarily plausible assertions/evidence/guidance) to it. Plato has been credited for the ''justified true belief'' theory of knowledge, even though Plato in the ''Theaetetus'' elegantly dismisses it, and even posits this argument of Socrates as a cause for his death penalty. The epistemologists, Gettier and
GoldmanGoldman is a Jewish surname. Notable people with the surname include: *Alan J. Goldman (1932–2010), American expert in operations research *Alan H. Goldman (born 1945), American philosopher *Alan S. Goldman (born 1958), American chemist *Alain Gold ...
, have questioned the "justified true belief" definition.

## Justified true belief

Justified true belief is a definition of
knowledge Knowledge is a familiarity or awareness, of someone or something, such as facts A fact is an occurrence in the real world. The usual test for a statement of fact is verifiability—that is whether it can be demonstrated to correspond to exp ...
that gained approval during the
Enlightenment Enlightenment, enlighten or enlightened may refer to: Age of Enlightenment * Age of Enlightenment, period in Western intellectual history from the late 17th to late 18th century, centered in France but also encompassing: ** Midlands Enlightenment ...
, "justified" standing in contrast to "revealed". There have been attempts to trace it back to
Plato Plato ( ; grc-gre, Πλάτων ; 428/427 or 424/423 – 348/347 BC) was an Athenian , image_skyline = File:Athens Montage L.png, center, 275px, alt=Athens montage. Clicking on an image in the picture causes the ...

and his dialogues, more specifically in the '' Theaetetus.'' The concept of justified true belief states that in order to know that a given proposition is true, one must not only believe the relevant true proposition, but also have justification for doing so. In more formal terms, an agent $S$ knows that a proposition $P$ is true
if and only if In logic and related fields such as mathematics and philosophy, "if and only if" (shortened as "iff") is a biconditional logical connective between statements, where either both statements are true or both are false. The connective is bicondit ...
: *$P$ is true *$S$ believes that $P$ is true, and *$S$ is justified in believing that $P$ is true This theory of knowledge suffered a significant setback with the discovery of
Gettier problem The Gettier problem, in the field of epistemology Epistemology (; ) is the Outline of philosophy, branch of philosophy concerned with knowledge. Epistemologists study the nature, origin, and scope of knowledge, epistemic Justification (episte ...
s, situations in which the above conditions were seemingly met but where many philosophers deny that anything is known.
Robert Nozick Robert Nozick (; November 16, 1938 – January 23, 2002) was an American philosopher A philosopher is someone who practices philosophy. The term ''philosopher'' comes from the grc, φιλόσοφος, , translit=philosophos, meaning 'lov ...
suggested a clarification of "justification" which he believed eliminates the problem: the justification has to be such that were the justification false, the knowledge would be false. Bernecker and Dretske (2000) argue that "no epistemologist since Gettier has seriously and successfully defended the traditional view." On the other hand,
Paul Boghossian Paul Artin Boghossian (; born 1957) is an American philosopher. He is Silver Professor of Philosophy Philosophy (from , ) is the study of general and fundamental questions, such as those about reason, Metaphysics, existence, Epistemolog ...
argues that the justified true belief account is the "standard, widely accepted" definition of knowledge., Chapter 2, p. 15.

## Belief systems

A belief system comprises a set of mutually supportive beliefs. The beliefs of any such system can be
religious Religion is a social Social organisms, including humans, live collectively in interacting populations. This interaction is considered social whether they are aware of it or not, and whether the exchange is voluntary/involuntary. Etymology ...
,
philosophical Philosophy (from , ) is the study of general and fundamental questions, such as those about existence Existence is the ability of an entity to interact with physical or mental reality Reality is the sum or aggregate of all that is real o ...

,
political Politics (from , ) 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 between individuals, such as the distribution of reso ...

,
ideological An ideology () is a set of belief A belief is an Attitude (psychology), attitude that something is the case, or that some proposition about the world is truth, true. In epistemology, philosophers use the term "belief" to refer to attitudes abo ...
, or a combination of these. Philosopher
Jonathan Glover Jonathan Glover (; born 1941) is a United Kingdom, British philosopher known for his books and studies on ethics. He currently teaches ethics at King's College London. Glover is a fellow of the Hastings Center, an independent bioethics research i ...
says that beliefs are always part of a belief system, and that tenanted belief systems are difficult for the tenants to completely revise or reject."Jonathan Glover on systems of belief", Philosophy Bites Podcast, Oct 9 2011
/ref> He suggests that beliefs have to be considered holistically, and that no belief exists in isolation in the mind of the believer. Each belief always implicates and relates to other beliefs. Glover provides the example of a patient with an illness who returns to a doctor, but the doctor says that the prescribed medicine is not working. At that point, the patient has a great deal of flexibility in choosing what beliefs to keep or reject: the patient could believe that the doctor is incompetent, that the doctor's assistants made a mistake, that the patient's own body is unique in some unexpected way, that Western medicine is ineffective, or even that Western science is entirely unable to discover truths about ailments. This insight has relevance for
inquisitor An inquisitor was an official An official is someone who holds an office (function or mandate, regardless whether it carries an actual working space with it) in an organization or government A government is the system or group of p ...
s,
missionaries A missionary is a member of a religious group sent into an area to promote their faith or provide services, such as education Education is the process of facilitating learning, or the acquisition of knowledge, skills, value (ethics), va ...

,
agitprop Agitprop (; from rus, агитпроп, r=Agitpróp, portmanteau of ''agitatsiya'', "agitation" and ''propaganda'', "propaganda") is the promulgation of ideas (in Russian, "propaganda" does not have the pejorative connotation that it has acquired ...
groups and thought-police. The British philosopher Stephen Law has described some belief systems (including belief in
homeopathy Homeopathy or homoeopathy is a pseudoscientific system of alternative medicine Alternative medicine is any practice that aims to achieve the healing effects of medicine Medicine is the Art (skill), art, science, and Praxis (process) ...
,
psychic powers Psychic abilities * Apportation – The ability to undergo materialization, disappearance or teleportation of an object. * Astral projection or mental projection – The ability to voluntarily project the astral body (consciousness , an Englis ...
, and
alien abduction Alien abduction, sometimes also called abduction phenomenon, alien abduction syndrome or UFO abduction, is when an alleged "abductee" describes "real experiences" of being secretly kidnapped by non-human entities ( aliens) and subjected to physica ...
) as "claptrap" and says that such belief-systems can "draw people in and hold them captive so they become willing slaves of claptrap ..if you get sucked in, it can be extremely difficult to think your way clear again".

# Religion

Religious belief refers to attitudes towards
mythological Myth is a folklore genre Folklore is the expressive body of culture shared by a particular group of people; it encompasses the traditions common to that culture, subculture or group. These include oral traditions such as Narrative, tales, p ...
,
supernatural The supernatural encompasses supposed phenomena or entities that are not subject to the laws of nature. This term is attributed to non-physical entities, such as angel An angel is a supernatural spiritual being who, according to v ...

, or aspects of a
religion Religion is a social Social organisms, including humans, live collectively in interacting populations. This interaction is considered social whether they are aware of it or not, and whether the exchange is voluntary/involuntary. Etymology ...

. Religious belief is distinct from
religious practice Religion is a social Social organisms, including humans, live collectively in interacting populations. This interaction is considered social whether they are aware of it or not, and whether the exchange is voluntary/involuntary. Etymology ...
and from
religious behaviour Religious behaviours are behaviours motivated by religious beliefs. Religious actions are also called 'ritual A ritual is a sequence of activities involving gestures, words, actions, or objects, performed in a sequestered place and according t ...
s – with some believers not practicing
religion Religion is a social Social organisms, including humans, live collectively in interacting populations. This interaction is considered social whether they are aware of it or not, and whether the exchange is voluntary/involuntary. Etymology ...

and some practitioners not believing religion. Religious beliefs, deriving from ideas that are exclusive to religion, often relate to the existence, characteristics and worship of a
deity A deity or god is a supernatural being considered divinity, divine or sacred. The ''Oxford Dictionary of English'' defines deity as "a God (male deity), god or goddess (in a polytheistic religion)", or anything revered as divine. C. Scott Littlet ...
or deities, to the idea of in the
universe The universe ( la, universus) is all of space and time and their contents, including planets, stars, galaxy, galaxies, and all other forms of matter and energy. The Big Bang theory is the prevailing cosmological description of the development ...

and in , or to the
deontological In moral philosophy Ethics or moral philosophy is a branch of philosophy Philosophy (from , ) is the study of general and fundamental questions, such as those about reason, Metaphysics, existence, Epistemology, knowledge, Ethics, v ...
explanations for the values and practices centered on the teachings of a or
community A community is a social unitThe term "level of analysis" is used in the social sciences to point to the location, size, or scale of a research target. "Level of analysis" is distinct from the term " unit of observation" in that the former refer ...

. In contrast to other
belief system A belief is an attitude that something is the case, or that some proposition In linguistics and logic, a proposition is the meaning of a declarative sentence. In philosophy, "Meaning (philosophy), meaning" is understood to be a non-linguist ...
s, religious beliefs are usually codified.

## Forms

A popular view holds that different religions each have identifiable and exclusive sets of beliefs or
creed A creed, also known as a confession of faith, symbol, or statement of faith, is a statement of the shared beliefs of (an often religious) community in a form structured by subjects summarizing core tenets. The earliest known creed in Christia ...
s, but surveys of religious belief have often found that the official doctrine and descriptions of the beliefs offered by religious authorities do not always agree with the privately held beliefs of those who identify as members of a particular religion. For a broad classification of the kinds of religious belief, see below.

### Fundamentalism

First self-applied as a term to the conservative doctrine outlined by anti-modernist
Protestants Protestantism is a form of Christianity Christianity is an Abrahamic religions, Abrahamic Monotheism, monotheistic religion based on the Life of Jesus in the New Testament, life and Teachings of Jesus, teachings of Jesus, Jesus of Nazareth. ...
in the United States, "fundamentalism" in religious terms denotes strict adherence to an interpretation of scriptures that are generally associated with theologically conservative positions or traditional understandings of the text and are distrustful of innovative readings, new revelation, or alternative interpretations. Religious fundamentalism has been identified in the media as being associated with fanatical or zealous political movements around the world that have used a strict adherence to a particular religious doctrine as a means to establish political identity and to enforce societal norms.

### Orthodoxy

First used in the context of
Early Christianity The history of Christianity concerns the Christianity, Christian religion, Christendom, Christian countries, and the Christian Church, Church with its various Christian denomination, denominations, from the Christianity in the 1st century, 1st ...
, the term "orthodoxy" relates to religious belief that closely follows the edicts, apologies, and
hermeneutics Hermeneutics () is the theory and methodology Methodology is "'a contextual framework' for research, a coherent and logical scheme based on views, beliefs, and values, that guides the choices researchers r other usersmake". It comprises ...
of a prevailing religious authority. In the case of Early Christianity, this authority was the communion of bishops, and is often referred to by the term "
Magisterium The magisterium of the Catholic Church The Catholic Church, often referred to as the Roman Catholic Church, is the List of Christian denominations by number of members, largest Christian church, with approximately 1.3 billion baptise ...
". The term ''orthodox'' was applied almost as an epithet to a group of Jewish believers who held to pre-Enlightenment understanding of Judaism – now known as
Orthodox Judaism Orthodox Judaism is the collective term for the traditionalist branches of contemporary Judaism. Jewish theology, Theologically, it is chiefly defined by regarding the Torah, both Torah, Written and Oral Torah, Oral, as Sinai Revelation, reveale ...
. The
Eastern Orthodox Church The Eastern Orthodox Church, also called the Orthodox Church, is the second-largest Christian church, with approximately 220 million baptised members. It operates as a communion Communion may refer to: Religion * The Eucharist (also call ...
of Christianity and the
Catholic Church The Catholic Church, also known as the Roman Catholic Church, is the List of Christian denominations by number of members, largest Christian church, with 1.3 billion baptised Catholics Catholic Church by country, worldwide . As the wor ...

each consider themselves to be the true heir to Early Christian belief and practice. The antonym of "orthodox" is "
heterodox In religion, heterodoxy (from 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 follow ...
", and those adhering to orthodoxy often accuse the heterodox of
apostasy Apostasy (; grc-gre, ἀποστασία ''apostasía'', "a defection or revolt") is the formal religious disaffiliation, disaffiliation from, abandonment of, or renunciation of a religion by a person. It can also be defined within the broader ...
,
schism A schism ( , , or, less commonly, ) is a division between people, usually belonging to an organization, movement, or religious denomination. The word is most frequently applied to a split in what had previously been a single religious body, su ...
, or
heresy Heresy is any belief or theory that is strongly at variance with established beliefs or customs, in particular the accepted beliefs of a church or religious organization. The term is usually used in reference to violations of important religi ...
.

### Modernism/reform

The
Renaissance The Renaissance ( , ) , from , with the same meanings. is a period Period may refer to: Common uses * Era, a length or span of time * Full stop (or period), a punctuation mark Arts, entertainment, and media * Period (music), a concept in m ...

and later the
Enlightenment Enlightenment, enlighten or enlightened may refer to: Age of Enlightenment * Age of Enlightenment, period in Western intellectual history from the late 17th to late 18th century, centered in France but also encompassing: ** Midlands Enlightenment ...
in Europe exhibited varying degrees of
religious tolerance Toleration is the allowing, permitting, or acceptance of an action, idea, object, or person which one dislikes or disagrees with. Political scientist Andrew R. Murphy explains that "We can improve our understanding by defining "toleration" as a ...
and intolerance towards new and old religious ideas. The ''
philosophes The ''philosophes'' (French for " philosophers") were the intellectuals of the 18th-century Enlightenment.Kishlansky, Mark, ''et al.'' ''A Brief History of Western Civilization: The Unfinished Legacy, volume II: Since 1555.'' (5th ed. 2007). Few ...
'' took particular exception to many of the more fantastical claims of religions and directly challenged religious authority and the prevailing beliefs associated with the established churches. In response to the liberalizing political and social movements, some religious groups attempted to integrate Enlightenment ideals of rationality, equality, and individual liberty into their belief systems, especially in the nineteenth and twentieth centuries.
Reform Judaism Reform Judaism (also known as Liberal Judaism or Progressive Judaism) is a major Jewish denomination that emphasizes the evolving nature of the faith, the superiority of its ethical aspects to the ceremonial ones, and belief in a continuous rev ...
and
Liberal Christianity Liberal Christianity, also known as liberal theology, is a movement that interprets Christianity, Christian teaching by taking into consideration modern knowledge, science and ethics. It emphasizes the importance of reason and experience over d ...
offer two examples of such religious associations.

## Attitudes to other religions

Adherents of particular religions deal with the differing doctrines and practices espoused by other religions or by other
religious denomination A religious denomination is a subgroup within a religion that operates under a common name, tradition, and identity. The term refers to the various Christian denominations (for example, Eastern Orthodox Church, Eastern Orthodox, Catholic Church ...
s in a variety of ways.

### Exclusivism

People with exclusivist beliefs typically explain other beliefs either as in error, or as corruptions or counterfeits of the true faith. This approach is a fairly consistent feature among smaller
new religious movement A new religious movement (NRM), also known as a new religion or an alternative spirituality, is a religious or spirituality, spiritual group that has modern origins but is peripheral to its society's dominant religious culture. NRMs can be novel ...
s that often rely on doctrine that claims a unique
revelation In religion Religion is a social system, social-cultural system of designated religious behaviour, behaviors and practices, morality, morals, beliefs, worldviews, religious text, texts, shrine, sanctified places, prophecy, prophecies, eth ...

by the founders or leaders, and considers it a matter of faith that the "correct" religion has a monopoly on truth. All three major Abrahamic religions, Abrahamic monotheistic religions have passages in their holy scriptures that attest to the primacy of the scriptural testimony, and indeed monotheism itself is often vouched as an innovation characterized specifically by its explicit rejection of earlier polytheistic faiths. Some exclusivist faiths incorporate a specific element of proselytization. This is a strongly-held belief in the Christian tradition which follows the doctrine of the Great Commission, and is less emphasized by the Islamic faith where the Quranic edict "There shall be no compulsion in religion" (2:256) is often quoted as a justification for toleration of alternative beliefs. The Conversion to Judaism, Jewish tradition does not actively seek out converts. Exclusivism correlates with conservative, fundamentalist, and orthodox approaches of many religions, while pluralistic and syncretist approaches either explicitly downplay or reject the exclusivist tendencies within a religion.

### Inclusivism

People with inclusivism, inclusivist beliefs recognize some truth in all faith systems, highlighting agreements and minimizing differences. This attitude is sometimes associated with Interfaith dialogue or with the Christian Ecumenical movement, though in principle such attempts at pluralism are not necessarily inclusivist and many actors in such interactions (for example, the Roman Catholic Church) still hold to exclusivist dogma while participating in inter-religious organizations. Explicitly inclusivist religions include many that are associated with the New Age movement, as well as modern reinterpretations of Hinduism and Buddhism. The Baháʼí Faith considers it doctrine that there is truth in all faith-systems. Religious pluralism, Pluralism and Syncretism, syncretism are two closely related concepts. People with pluralist beliefs make no distinction between faith systems, viewing each one as valid within a particular culture. People with syncretic views blend the views of a variety of different religions or traditional beliefs into a unique fusion which suits their particular experiences and contexts (''see'' eclecticism). Unitarian Universalism exemplifies a syncretic faith.

Typical reasons for adherence to religion include the following: * Some see belief in a deity as necessary for Morality, moral behavior.Compare: * Some regard religious practices as serene, beautiful, and conducive to religious experiences, which in turn support religious beliefs. * Organized religions promote a sense of community among their followers, and the moral and cultural common ground of these communities makes them attractive to people with similar values. Indeed, while religious beliefs and practices are usually connected, some individuals with substantially secular beliefs still participate in religious practices for cultural reasons. * Each religion asserts that it is a means by which its adherents may come into closer contact with the Divine, with Truth, and with spiritual power. They all promise to free adherents from spiritual bondage, and to bring them into spiritual freedom. It naturally follows that a religion which can free its adherents from deception, sin, and spiritual death will have significant mental-health benefits. Abraham Maslow's research after World War II showed that the Holocaust, Holocaust survivors tended to be those who held strong religious beliefs (not necessarily temple attendance, etc.), suggesting that belief helped people cope in extreme circumstances. Humanistic psychology went on to investigate how religious or spiritual identity may have correlations with longer lifespan and better health. The study found that humans may particularly need religious ideas to serve various emotional needs such as the need to feel loved, the need to belong to homogeneous groups, the need for understandable explanations and the need for a guarantee of ultimate justice. Other factors may involve sense of purpose, sense of Identity (social science), identity, or a sense of contact with the divine. See also ''Man's Search for Meaning'', by Viktor Frankl, detailing his experience with the importance of religion in surviving the Holocaust. Critics assert that the very fact that religion was the primary selector for research subjects may have introduced a bias, and that the fact that all subjects were Holocaust survivors may also have had an effect. According to Larson et al. (2000), "[m]ore longitudinal research with better multidimensional measures will help further clarify the roles of these [religious] factors and whether they are beneficial or harmful." Psychologist James Alcock also summarizes a number of apparent benefits which reinforce religious belief. These include prayer appearing to account for successful resolution of problems, "a bulwark against existential anxiety and fear of annihilation," an increased sense of control, companionship with one's deity, a source of self-significance, and group identity.

## Apostasy

Typical reasons for rejection of religion include: * Some people regard certain fundamental doctrines of some religions as illogical, contrary to experience, or unsupported by sufficient evidence; such people may reject one or more religions for those reasons.For example: Even some believers may have difficulty accepting particular religious assertions or doctrines. Some people believe the body of evidence available to humans to be insufficient to justify certain religious beliefs. They may thus disagree with religious interpretations of ethics and human purpose, or with various creation myths. This reason has perhaps been aggravated by the protestations and emphases of some Fundamentalist Christianity, fundamentalist Christians. * Some religions include beliefs that certain groups of people are inferior or sinful and deserve contempt, persecution, or even death, and that non-believers will be punished for their unbelief in an after-life. Adherents to a religion may feel antipathy to unbelievers. Numerous examples exist of people of one religion or sect using religion as an excuse to murder people with different religious beliefs. To mention just a few examples: ** the slaughter of the Huguenots by French Catholics in the sixteenth century ** Hindus and Muslims killing each other when Pakistan separated from India in 1947 ** the persecution and killing of Shiite Muslims by Sunni Muslims in Iraq ** the murder of Protestants by Catholics and vice versa in Ireland (both of these examples in the late twentieth century) ** the Israeli–Palestinian conflict that continues – According to some critics of religion, such beliefs can encourage completely unnecessary conflicts and in some cases even wars. Many atheists believe that, because of this, religion is incompatible with world peace, freedom, civil rights, equality, and good government. On the other hand, most religions perceive atheism as a threat and will vigorously and even violently defend themselves against religious sterilization, making the attempt to remove public religious practices a source of strife. * Some people may be unable to accept the values that a specific religion promotes and will therefore not join that religion. They may also be unable to accept the proposition that those who do not believe will go to hell or be damned, especially if said nonbelievers are close to the person. * The maintenance of Personal life, life and the achievement of self-esteem require of a person the fullest exercise of reason—but morality (people are taught) rests on and requires faith.

# Psychology

Mainstream psychology and related disciplines have traditionally treated belief as if it were the simplest form of mental representation and therefore one of the building blocks of conscious thought. Philosophers have tended to be more abstract in their analysis, and much of the work examining the viability of the belief concept stems from philosophical analysis. The concept of belief presumes a subject (the believer) and an object of belief (the proposition). So, like other
propositional attitude A propositional attitude is a mental state held by an agent toward a proposition In linguistics and logic, a proposition is the meaning of a declarative sentence. In philosophy, "Meaning (philosophy), meaning" is understood to be a non-linguisti ...
Daniel Dennett Daniel Clement Dennett III (born March 28, 1942) is an American philosopher A philosopher is someone who practices philosophy. The term ''philosopher'' comes from the grc, φιλόσοφος, , translit=philosophos, meaning 'lover of wisdom' ...
and Lynne Rudder Baker, are both eliminativists in that they hold that beliefs are not a scientifically valid concept, but they do not go as far as rejecting the concept of belief as a predictive device. Dennett gives the example of playing a computer at chess. While few people would agree that the computer held beliefs, treating the computer as if it did (e.g. that the computer believes that taking the opposition's queen will give it a considerable advantage) is likely to be a successful and predictive strategy. In this understanding of belief, named by Dennett ''the
intentional stanceThe intentional stance is a term coined by philosopher A philosopher is someone who practices philosophy. The term ''philosopher'' comes from the grc, φιλόσοφος, , translit=philosophos, meaning 'lover of wisdom'. The coining of the term ...
'', belief-based explanations of mind and behaviour are at a different level of explanation and are not reducible to those based on fundamental neuroscience, although both may be explanatory at their own level. Strategic approaches make a distinction between rules, norms and beliefs as follows: * Rules. Explicit regulative processes such as policies, laws, inspection routines, or incentives. Rules function as a coercive regulator of behavior and are dependent upon the imposing entity's ability to enforce them. * Norms. Regulative mechanisms accepted by the social collective. Norms are enforced by normative mechanisms within the organization and are not strictly dependent upon law or regulation. * Beliefs. The collective perception of fundamental truths governing behavior. The adherence to accepted and shared beliefs by members of a social system will likely persist and be difficult to change over time. Strong beliefs about determinant factors (i.e., security, survival, or honor) are likely to cause a social entity or group to accept rules and norms.

## Belief formation and revision

An extensive amount of scientific research and philosophical discussion exists around the modification of beliefs, which is commonly referred to as belief revision. Generally speaking, the process of belief revision entails the believer weighing the set of truths and/or evidence, and the dominance of a set of truths or evidence on an alternative to a held belief can lead to revision. One process of belief revision is Bayesian inference, Bayesian updating and is often referenced for its mathematical basis and conceptual simplicity. However, such a process may not be representative for individuals whose beliefs are not easily characterized as probabilistic. There are several techniques for individuals or groups to change the beliefs of others; these methods generally fall under the umbrella of persuasion. Persuasion can take on more specific forms such as consciousness raising when considered in an activist or political context. Belief modification may also occur as a result of the experience of outcomes. Because goals are based, in part on beliefs, the success or failure at a particular goal may contribute to modification of beliefs that supported the original goal. Whether or not belief modification actually occurs is dependent not only on the extent of truths or evidence for the alternative belief, but also characteristics outside the specific truths or evidence. This includes, but is not limited to: the source characteristics of the message, such as Source credibility, credibility; Peer pressure, social pressures; the anticipated consequences of a modification; or the ability of the individual or group to act on the modification. Therefore, individuals seeking to achieve belief modification in themselves or others need to consider all possible forms of resistance to belief revision. Glover maintains that any person can continue to hold any belief if they would really like to (for example, with help from ad hoc hypotheses, ''ad hoc'' hypotheses). One belief can be held fixed, and other beliefs will be altered around it. Glover warns that some beliefs may not be entirely Explicit memory, explicitly believed (for example, some people may not realize they have racist belief-systems adopted from their environment as a child). Glover believes that people tend to first realize that beliefs can change, and may be contingent on their upbringing, around age 12 or 15. Glover emphasizes that beliefs are difficult to change. He says that one may try to rebuild one's beliefs on more secure foundations (axioms), like building a new house, but warns that this may not be possible. Glover offers the example of René Descartes, saying: "[Descartes] starts off with the characteristic beliefs of a 17th-century Frenchman; he then junks the lot, he rebuilds the system, and somehow it looks a lot like the beliefs of a 17th-century Frenchman." To Glover, belief systems are not like houses but are instead like boats. As Glover puts it: "Maybe the whole thing needs rebuilding, but inevitably at any point you have to keep enough of it intact to keep floating."

### Models of belief formation

Psychologists study belief formation and the relationship between beliefs and actions. Three types of models of belief formation and change have been proposed: conditional inference process models, linear models and information processing models. ''Conditional inference process models'' emphasize the role of inference for belief formation. When people are asked to estimate the likelihood that a statement is true, they search their memory for information that has implications for the validity of this statement. Once this information has been identified, they estimate the likelihood that the statement would be true if the information were true, and the likelihood that the statement would be true if the information were false. If their estimates for these two Probability, probabilities differ, people average them, weighting each by the likelihood that the information is true and false. Thus, information bears directly on beliefs of another, related statement.Wyer, R.S., & Albarracin, D. (2005). Belief formation, organization, and change: Cognitive and motivational influences. In D. Albarracin, B.T. Johnson, & M.P. Zanna, The Handbook of Attitudes (273–322). New York: Psychology Press. Unlike the previous model, ''linear models'' take into consideration the possibility of multiple factors influencing belief formation. Using regression procedures, these models predict belief formation on the basis of several different pieces of information, with weights assigned to each piece on the basis of their relative importance. These ''information processing models'' address the fact that the responses people have to belief-relevant information is unlikely to be predicted from the objective basis of the information that they can recall at the time their beliefs are reported. Instead, these responses reflect the number and meaning of the thoughts that people have about the message at the time that they encounter it. Some influences on people's belief formation include: * Internalization of beliefs during childhood, which can form and shape our beliefs in different domains. Albert Einstein is often quoted as having said that "Common sense is the collection of prejudices acquired by age eighteen." Political beliefs depend most strongly on the political beliefs most common in the community where we live. Most individuals believe the
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## Prediction

Different psychological models have tried to predict people's beliefs and some of them try to estimate the exact probabilities of beliefs. For example, Robert S. Wyer, Robert Wyer developed a model of subjective probabilities. When people rate the likelihood of a certain statement (e.g., "It will rain tomorrow"), this rating can be seen as a subjective probability value. The subjective probability model posits that these subjective probabilities follow the same rules as objective probabilities. For example, the law of total probability might be applied to predict a subjective probability value. Wyer found that this model produces relatively accurate predictions for probabilities of single events and for changes in these probabilities, but that the probabilities of several beliefs linked by "and" or "or" do not follow the model as well.

## Delusion

Delusions are defined as fixed false beliefs that are not changed even when confronted with conflicting evidence. Psychiatrist and historian G.E. Berrios (1940- ) has challenged the view that delusions are genuine beliefs and instead labels them as "empty speech acts", where affected persons are motivated to express false or bizarre belief statements due to an underlying psychological disturbance. However, the majority of mental health professionals and researchers treat delusions as if they were genuine beliefs.

## Emotion and beliefs

Research has indicated that emotion and cognition act in conjunction to produce beliefs, and more specifically emotion plays a vital role in the formation and maintenance of beliefs.