Edwin Hatch,
The influence of Greek ideas and usages upon the Christian church
(1914)
“ When, therefore, the use of ousia in its Neo-Platonic sense prevailed, there arose a tendency to differentiate the two terms, and to designate that which in Aristotle had been πρώτη οὐσία by the term ὑπόστασις. This is expressed by Athanasius when he says: “Ousia signifies community,” while “hypostasis has property which is not common to the hypostases of the same ousia;” ”
