In scholastic

philosophy Philosophy (from , ) is the systematized study of general and fundamental questions, such as those about existence, reason, knowledge, values, mind, and language. Such questions are often posed as problems to be studied or resolved. ...

, ''Actus Purus'' (

English English usually refers to: * English language * English people English may also refer to: Peoples, culture, and language * ''English'', an adjective for something of, from, or related to England ** English national ...

: "Pure Actuality," "Pure Act") is the absolute perfection of

God In monotheistic thought, God is usually viewed as the supreme being, creator, and principal object of faith. Swinburne, R.G. "God" in Honderich, Ted. (ed)''The Oxford Companion to Philosophy'', Oxford University Press, 1995. God is typically ...

Overview

Created beings have potentiality that is not actuality, imperfections as well as perfection. Only God is simultaneously all that He can be, infinitely real and infinitely perfect: ' I am who I am' (

Exodus Exodus or the Exodus may refer to: Religion * Book of Exodus, second book of the Hebrew Torah and the Christian Bible * The Exodus, the biblical story of the migration of the ancient Israelites from Egypt into Canaan Historical events * E ...

). His attributes or His operations are really identical with His

essence Essence ( la, essentia) is a polysemic term, used in philosophy and theology as a designation for the property or set of properties that make an entity or substance what it fundamentally is, and which it has by necessity, and without which it ...

, and His essence necessitates His

existence Existence is the ability of an entity to interact with reality. In philosophy, it refers to the ontological property of being. Etymology The term ''existence'' comes from Old French ''existence'', from Medieval Latin ''existentia/exsistentia' ...

. (Contrast this understanding with the Essence–Energies distinction in

Eastern Christian Eastern Christianity comprises Christian traditions and church families that originally developed during classical and late antiquity in Eastern Europe, Southeastern Europe, Asia Minor, the Caucasus, Northeast Africa, the Fertile Crescent and ...

, particularly Palamite, theology). In created beings, the state of potentiality precedes that of actuality; before being realized, a perfection must be capable of realization. But, absolutely speaking, actuality precedes potentiality. For in order to change, a thing must be acted upon, or actualized; change and potentiality presuppose, therefore, a being which is '' in actu''. This actuality, if mixed with potentiality, presupposes another actuality, and so on, until we reach the ''actus purus''. According to

Thomas Aquinas Thomas Aquinas, Dominican Order, OP (; it, Tommaso d'Aquino, lit=Thomas of Aquino, Italy, Aquino; 1225 – 7 March 1274) was an Italian Dominican Order, Dominican friar and Catholic priest, priest who was an influential List of Catholic philo ...

, angelic doctor of the church, a thing which requires completion by another is said to be in potency to that other: realization of potency is called actuality. The universe is conceived of as a series of things arranged in an ascending order, or potency and act at once crowned and created by God, who alone is Pure Act. God is changeless because change means passage from potency to act, and so He is without beginning and end, since these demand change.

Matter In classical physics and general chemistry, matter is any substance that has mass and takes up space by having volume. All everyday objects that can be touched are ultimately composed of atoms, which are made up of interacting subatomic part ...

and

form Form is the shape, visual appearance, or configuration of an object. In a wider sense, the form is the way something happens. Form also refers to: *Form (document), a document (printed or electronic) with spaces in which to write or enter data * ...

are necessary to the understanding of change, for change requires the union of that which becomes and that which it becomes. Matter is the first, and form the second. All physical things are composed of matter and form. The difference between a thing as form or character and the actual existence of it is denoted by the terms essence and being (or existence). It is only in God that there is no distinction between the two. Both pairs – matter and form, essence and being – are special cases of potency and act. They are also modes: modes do not add anything to the idea of being, but are ways of making explicit what is implicit in it.

References

Scholasticism {{Catholic-Church-stub

Overview

See also

References