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The term οὐσία is an Ancient Greek noun, formed on the feminine present participle of the verb εἰμί, eimí, i.e., "to be, I am". In Latin, it was translated as essentia or substantia. Ancient Roman philosopher Seneca and rhetorician Quintilian used essentia as equivalent for οὐσία, while Apuleius rendered οὐσία both as essentia or substantia. In order to designate οὐσία, Early Christian theologian Tertullian favored the use of substantia over essentia, while Augustine of Hippo and Boethius took the opposite stance, preferring the use of essentia as designation for οὐσία. Some of the most prominent Latin authors, like Hilary of Poitiers, noted that those variants were often being used with different meanings. Some modern authors also point out that the Greek term οὐσία is properly translated as essentia (essence), while substantia has a wider spectrum of meanings.
From οὐσία (essence), philosophical and theological term οὐσιότης (essentiality) was also derived. It was used by Platonists, like Alcinous, as designation for one of the basic properties of divinity or godhead.
Aristotle defined protai ousiai (πρῶται οὐσίαι), "primary substances", in the Categories as that which is neither said of nor in any subject, e.g., "this human" in particular, or "this ox". The genera in biology and other natural kinds are substances in a secondary sense, as universals, formally defined by the essential qualities of the primary substances; i.e., the individual members of those kinds.
In Book IV of Metaphysics Aristotle explores the nature and attributes of being (ousia). Aristotle divides the things that there are, or "beings," into categories. Aristotle calls these substances and argues that there are many senses in which a thing may be said "to be" but it is related to one central point and is ambiguous.
Aristotle states that there are both primary and secondary substances. In Categories Aristotle argues that primary substances are ontologically based and if the primary substances did not exist then it would be impossible for other things to exist. The other things are regarded as the secondary substances (also known as accidents). Secondary substances are thus ontologically dependent on substances. 
In Metaphysics, Aristotle states that everything which is healthy is related to health (primary substance) as in one sense because it preserves health and in the other because it is capable of it. Without the primary substance (health) we would not be able to have the secondary substances (anything related to health). While all the secondary substances are deemed "to be" it is in relation to the primary substance.
The question, what is being, is seeking an answer to something "that is." A contemporary example in rhetoric would be to look at a color. Using white as an example, when we define a color, we define it by association. Snow is white. Paper is white. A cow is white. But what is white? While we are saying things that are white, we are not defining what white is without qualification. Ousia is thus the answer to the question of "what is being" when the question is without qualification. The unqualified answer of what is white is the ousia of white.
Much later, Martin Heidegger said that the original meaning of the word ousia was lost in its translation to the Latin, and, subsequently, in its translation to modern languages. For him, ousia means Being, not substance, that is, not some thing or some being that "stood" (-stance) "under" (sub-). Moreover, he also used the binomial parousia–apousia, denoting presence–absence,[clarification needed] and hypostasis denoting existence.
The concept of θεία ουσία (divine essence) is one of the most important concepts in Christian theology. It was developed gradually, by Early Church Fathers during the first centuries of Christian History. Central debates over the doctrinal use and meaning of ουσία were held during the 4th century, and also continued later, some of them lasting up to the present day.
The word ousia is used in the New Testament only in relation to the substance in the sense of goods, twice in the parable of the Prodigal Son where the son asked his father to divide to him his inheritance, and then wasted it on riotous living.
An apparently related word, epiousios (affixing the prefix epi- to the word), is used in the Lord's Prayer, but nowhere else in the scriptures. Elsewhere, it was believed to be present in one papyrus (a list of expenses) among expenses for chick-peas, straw, etc., and for material. In 1998, according to a xerographic copy of a papyrus found in the Yale Papyrus Collection (from the Beinecke Rare Book and Manuscript Library) inventory 19 (a.k.a. P.C.+YBR inv 19), it was suggested that the document had been transcribed differently from other early manuscripts and that the actual word used in that particular papyrus was elaiou, meaning "oil".
Origen (d. 251) used ousia in defining God as one genus of ousia, while being three, distinct species of hypostasis: the Father, the Son, and the Holy Spirit. The Synods of Antioch condemned the word homoousios (same essence) because it originated in pagan Greek philosophy. The Catholic Encyclopedia entry for Paul of Samosata states:
It must be regarded as certain that the council, which condemned Paul, rejected the term homoousios; but, naturally, only in a false sense, used by Paul; not, it seems, because he meant by it a unity of Hypostasis in the Trinity (so St. Hilary), but because he intended, by it, a common essence, out of which both Father and Son proceeded, or which it divided between them — so St. Basil and St. Athanasius; but the question is not clear. The objectors to the Nicene doctrine in the fourth century made copious use of this disapproval of the Nicene word by a famous council.
In 325, the First Council of Nicaea condemned Arianism and formulated a creed, which stated that in the Godhead the Son was Homoousios (same in essence) of the Father. However, controversy did not stop and many Eastern clerics rejected the term because of its earlier condemnation in the usage of Paul of Samosata. Subsequent Emperors Constantius II (reigned 337-361) and Valens (reigned 364-378) supported Arianism and theologians came up with alternative wordings like Homoios (similar), homoiousios (similar in essence), or Anomoios (unsimilar). While the Homoios achieved the support of several councils and the Emperors, those of an opposing view were suppressed. The adherents of the Homoiousios eventually joined forces with the (mostly Western) adherents of the Homoousios and accepted the formulation of the Nicene creed.
The generally agreed-upon meaning of ousia in Eastern Christianity is "all that subsists by itself and which has not its being in another" - in contrast to hypostasis, which is used to mean "reality" or "existence". John Damascene gives the following definition of the conceptual value of the two terms in his Dialectic: Ousia is a thing that exists by itself, and which has need of nothing else for its consistency. Again, ousia is all that subsists by itself and which has not its being in another.
- Athanasopoulos & Schneider 2013.
- Commentary on Aristotle's Physics
- Owens 1951, p. 137-154.
- Brown 1996, p. 276.
- Weedman 2007.
- Pásztori-Kupán 2006, p. 59-60.
- Bracht 2009, p. 111.
- Cohen, S. Marc (2004). "Lecture on Categories".
Primary substances are fundamental in that "if they did not exist it would be impossible for any of the other things to exist". [Categories, 2b5]
- Aristotle. "Metaphysics" (PDF).
- Cohen, Mark. "Substances" (PDF).
- Cohen, Mark. "Substances" (PDF).
- Aristotle. "Metaphysics" (PDF).
- Heidegger 1996.
- Thomas Mozley The creed or a philosophy 1893 p. 303 "III 'OUSIA' IN THE NEW TESTAMENT The only appearance of this word in the New Testament is in two successive verses of the Parable of the Prodigal Son. It there designates first the 'living' which the Prodigal Son compelled his father..."
- Luke 15:12-13 Greek
- Kittel, G., Bromiley, G. W., & Friedrich, G. (Eds.). (1964–). Theological dictionary of the New Testament (electronic ed., Vol. 2, pp. 590–591). Grand Rapids, MI: Eerdmans.
- Discussion on the B-Greek mailing list. Tue Jun 7 15:43:35 EDT 2005
- Lossky 1976, p. 51.
- Lossky 1976, p. 50.
- Athanasopoulos, Constantinos; Schneider, Christoph, eds. (2013). Divine Essence and Divine Energies: Ecumenical Reflections on the Presence of God. Cambridge, UK: James Clarke & Co.
- Bracht, Katharina (2009). "God and Methodius". God in Early Christian Thought. Leiden-Boston: Brill. pp. 105–122.
- Franz Brentano, On the Several Senses of Being in Aristotle, (1862), Berkeley, University of California Press, 1976.
- Brown, Stephen F. (1996). "Theology and Philosophy". Medieval Latin: An Introduction and Bibliographical Guide. Washington, D.C.: CUA Press. pp. 267–287.
- Leo Donald Davis, The First Seven Ecumenical Councils (325-787): Their History and Theology, Liturgical Press, 1983. (ISBN 0-8146-5616-1)
- Heidegger, Martin (1996). Being and Time: A Translation of Sein und Zeit. Albany: State University of New York Press.
- Lossky, Vladimir (1976) . The Mystical Theology of the Eastern Church. Crestwood: St Vladimir's Seminary Press.
- Loux, Michael J. (2008) . Primary Ousia: An Essay on Aristotle's Metaphysics Z and H. Ithaca & London: Cornell University Press.
- Motte, André; Somville, Pierre, eds. (2008). Ousia dans la philosophie grecque des origines à Aristote. Louvain-la-Neuve: Peeters.
- Owens, Joseph (1951). The Doctrine of Being in the Aristotelian Metaphysics: A Study in the Greek Background of Mediaeval Thought. Toronto: Pontifical Institute of Mediaeval Studies.
- Pásztori-Kupán, István (2006). Theodoret of Cyrus. London & New York: Routledge.
- Weedman, Mark (2007). The Trinitarian Theology of Hilary of Poitiers. Leiden-Boston: Brill.
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