God the Word full by nature and in every way Perfect, and distributing out of His own fullness His own goods to the creature, we say was emptied: in no wise wronged in His own Proper Nature, nor changed so as to become otherwise, nor made in ought inferior, for inconvertible and unchangeable is Himself also even as He Who begat Him, and never may He be capable of passion. But when He was made Flesh, i.e. Man, He made (as He said, I will pour forth of My Spirit upon all flesh) the poverty of human nature His own; first, in that He was once made man, albeit He remained God; next in that He took the form of a servant, Who is in His own Nature free, as Son, and while He is Himself the Lord of glory He is said to receive glory: Himself Life, He is said to be quickened: and receives power over all, Himself King of all and with God, and… was obedient to the Father, suffered the Cross and so on. But these things befit the measure of the human nature, yet He makes them His own with flesh and fulfils the economy, remaining what He was.

(Cyril of Alexandria, Scholia on the Incarnation of the Only-Begotten, LFC 47 (Oxford: Oxford University Press, 1881), §5, https://www.tertullian.org/fathers/cyril_scholia_incarnation_01_text.htm#C5.)