“He came to be from nothing” (ἐξ οὐκ ὄντων ἐγένετο).  Cyril’s language is emphatic:  “As I have often said, He did not bring forth the Son from non-existence (ἐκ τοῦ μὴ ὄντος) into being, nor take the non-existent into Sonship § 14.  Cf. S. Alex. Epist. apud Theodoret, § 4:  “That the Son of God was not made ‘from things which are not,’ and that ‘there was no time when He was not,’ the Evangelist John sufficiently shews” (Ante-Nic. Library)..”