In the sequel of this last passage Cyril proceeds to argue that this unity of the Father and the Son lies in their Nature, “since God begat God,” in their Kingdom Cat. xv. § 27, note 3., in their Will Athan. Contra Arian, Or. ii. § 31, 1:  “For the Word of God is Framer and Maker, and He is the Father’s Will.  Cf. Or. iii. § 63 fin., and in their joint Creation Ib. Or. iii. § 11, 3:  “Such then being the Son, therefore when the Son works, the Father is the Worker.”, thus at each step rejecting some prominent heretical tenet.