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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.
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 uses the binomial parousia–apousia, denoting presence–absence, and hypostasis denoting existence.[clarification needed]
The word ousia is not used in the New Testament except 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 substance) 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 substance, 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.
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".
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 substance) 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 substance), 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.
Use in Rhetoric
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.
- Duns Scotus
- Essence–energies distinction (Eastern Orthodox theology)
- Physical ontology
- Commentary on Aristotle's Physics
- 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]
- Thomas Mozley The creed or a philosophy 1893 p303 "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
- St 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.Pg 50 The Mystical Theology of the Eastern Church, by Vladimir Lossky SVS Press, 1997. (ISBN 0-913836-31-1) James Clarke & Co Ltd, 1991. (ISBN 0-227-67919-9)
- Hypostasis meaning existence in general Pg 51 The Mystical Theology of the Eastern Church, by Vladimir Lossky SVS Press, 1997. (ISBN 0-913836-31-1) James Clarke & Co Ltd, 1991. (ISBN 0-227-67919-9)
- [Aristotle, Metaphysics. http://arpast.org/newsevents/articles/article47.pdf "Metaphysics"] Check
|url=value (help) (PDF).
|last1=in Authors list (help)
- Cohen, Mark. "Substances" (PDF).
- Cohen, Mark. "Substances" (PDF).
- "Metaphysics" (PDF).
|last1=in Authors list (help)
- Franz Brentano, On the Several Senses of Being in Aristotle, (1862), Berkeley, University of California Press, 1976.
- Leo Donald Davis, The First Seven Ecumenical Councils (325-787): Their History and Theology, Liturgical Press, 1983. (ISBN 0-8146-5616-1)
- Martin Heidegger, Being and Time [Sein und Zeit, Tübingen, Niemeyer, 1927].
- Vladimir Lossky The Mystical Theology of the Eastern Church, SVS Press, 1997. (ISBN 0-913836-31-1) James Clarke & Co Ltd, 1991. (ISBN 0-227-67919-9)
- André Motte, Pierre Somville (eds.), Ousia dans la philosophie grecque des origines à Aristote, Louvain-la-Neuve, Peeters 2008.
|Look up ousia in Wiktionary, the free dictionary.|