16. With the Son's origin as thus stated is connected the perfect birth of the undivided nature. For what in each is life, that in each is signified by essence. And in the life which is begotten of life, i.e. in the essence which is born of essence, seeing that it is not born unlike (and that because life is of life), He keeps in Himself a nature wholly similar to His original, because there is no diversity in the likeness of the essence that is born and that besets, that is, of the life which is possessed and which has been given. For though God begat Him of Himself, in likeness to His own nature, He in whom is the unbegotten likeness did not relinquish the property of His natural substance. For He only has what He gave; and as possessing life He gave life to be possessed. And thus what is born of essence, as life of life, is essentially like itself, and the essence of Him who is begotten and of Him who begets admits no diversity or unlikeness.

V. "It any one hearing the words formed or created it and begat me spoken by the same lips , refuses to understand this begat me of likeness of essence, but says that begat me and formed me are the same: as if to deny that the perfect Son of God was here signified as Son under two different expressions, as Wisdom has given Us to piously understand, and asserts that formed me and begat me only imply formation and not sonship: let him be anathema."