323 (1.323). TO CYRIL, ARCHBISHOP OF ALEXANDRIA.
Many scriptural testimonies, many patristic speculations set forth with certainty the true doctrines of the Incarnation of the Lord, even if this mystery exceeds what we can think or say about it.
The true God, who reigns over all things, was really made man without undergoing change in what He was, and in assuming what He was not, being the only Son (of/in two natures) without beginning or end, new and eternal: you cannot deny it, when you have, on these subjects, going in the same direction, many assertions of our holy Father, the great Athanasius, a man who went into these divine realities which are beyond our nature.