God Unchanged

Οὐκ ἔσται ἐν σοι Θεὸς πρόφατος.  Πῶς οὖν Θεοποιεῖται καθ' ὑμᾶς ἄνθρωπος τῇ πρὸς τὸν Λόγον σχετικῇ συναφεὶᾳ καὶ κοινωνὸς τῷ Πατρὶ τῆς δόξης καὶ  τῆς ἀξίας δείκνυται; Ἡμεῖς δὲ οὐκ ἄνθρωπον προσφάτως θεοποιεῖσθαι φάσκομεν· ἀλλὰ τὸν πρὸ αἰώνων ὄντα Υἱὸν τοῦ Θεοῦ καὶ Θεὸν, σεσαρκῶσθαι ἀτρέπτως. Μεμένηκεν γὰρ οὐδὲν ἔλαττον Θεὸς, καὶ γενόμενος ἄνθρωπος. Άγιος Ιωάννης ο Δαμασκηνός, Κατὰ τῆς Αἱρεσεως Των Νεστοριανῶν Source: Migne PG 95.194

'There shall not be among you a recent God.' 1  How then according to you does God make a man who is bound to the Word yet is deprived of the same glory and dignity with the Father? We say God made such a man recently, but that from eternity He truly was the Son of God and God, unchanged by the Incarnation. He remaining nothing less than God while made man. Saint John of Damascus, Against the Nestorian Heretics.   1  Ps 80.10