In Clement of Alexandria Fragm. § 50,
Sylb. 341., οὐσία means a
“nature” common to many, for he speaks of the Gnostic
Demiurge as creating an irrational soul ὁμοούσιον with the
soul of the beasts;” and again as implanting in man
“something co-essential (ὁμοούσιον) with
himself, inasmuch as he is invisible and incorporeal; his essence
(οὐσίαν) he
called “the breath of life,” but the thing formed
(μορφωθέν) became
“a living soul,” which in the prophetic Scriptures he
confesses himself to be.
Again in §42 of the same Fragment, according to the Valentinians,
“the body of Jesus is co-essential (ὁμοούσιον) with
the Church.”