[508-511(?)] As regards these things therefore I think that we ought to avoid this composite term, that we should call the Holy Trinity or the Father uni-essential, both because it is not found among the accurate fathers, and it gives occasions for the evil deviations of the heretics: but they called the Trinity co-essential, in order that by means of this word so plainly and very excellently stated there might be expressed in the same phrase both the oneness of the essence and the separation of the hypostases, and by means of this one word unity and division: for by being called co-essential with the Father and the Holy Spirit the Son claims to share essence3 with those who are reckoned with him, but to be distinct in hypostasis; for a man is not co-essential with himself, but one man with another.