Life-giving Word makes death-bound flesh his own to transmit grace
Cyril is closing his argument that the Word assumed flesh so that, having overcome death in it, he might pass that grace to us.
For this reason the life-giving Word of God made his own the flesh that death held fast, so that he might show it stronger than both death and corruption and pass that grace on to us. Just as we were brought down into death in Adam, so in Christ we have thrust aside death's tyranny and are being refashioned toward incorruption. [513d. From the same author, from the first book against Theodore.] Just as a human being is one from soul and body, even though the properties of each differ from one another as much as possible in what they are—for soul is other than body—so it would be understood also in the case of Christ, the Savior of us all.
Greek
καὶ ταύτης ἕνεκα τῆς αἰτίας ὁ ζωοποιὸς τοῦ Θεοῦ Λόγος ἰδίαν ἐποιήσατο σάρκα τὴν θανάτῳ κάτοχον, ἵνα κρείττονα καὶ θανάτου καὶ φθορᾶς αὐτὴν ἀποφήνας, παραπέμψῃ καὶ εἰς ἡμᾶς
τὴν χάριν. ὥσπερ γὰρ κατεβιβάσθημεν εἰς θάνατον ἐν Ἀδὰμ, οὕτως ἐν Χριστῷ τὴν θανάτου παρωσάμενοι τυραννίδα, πρὸς ἀφθαρσίαν ἀναμορφούμεθα. 513 δʹ. Τοῦ αὐτοῦ ἐκ τῶν κατὰ Θεοδώρου λόγου πρώτου. Ὥσπερ γὰρ ἐκ ψυχῆς καὶ σώματος ἄνθρωπος εἷς, καίτοι τῶν ἑκατέρων προσόντων ἰδιωμάτων πλείστην ὅσην ἐχόντων τὴν διαφορὰν πρὸς ἄλληλα κατά γε τὸ εἶναι τοιῶσδέ φημι· ψυχὴ γὰρ ἑτέρα παρὰ τὸ σῶμα· οὕτως ἂν νοοῖτο καὶ ἐπὶ τοῦ πάντων ἡμῶν Σωτῆρος Χριστοῦ.