Cyril of Alexandria

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(Epist. ad Monach. Egypt. [Ep. p. 7.]) What will any one see in the Blessed Virgin more than in other mothers, if she be not the mother of God, but of Christ, or the Lord, as Nestorius says? For it would not be absurd should any one please to name the mother of any anointed person, the mother of Christ. Yet she alone and more than they is called the Holy Virgin, and the mother of Christ. For she bare not a simple man as ye say, but rather the Word incarnate, and made man of God the Father. But perhaps you say, Tell me, do you think the Virgin was made the mother of His divinity? To this also we say, that the Word was born of the very substance of God Himself, and without beginning of time always coexisted with the Father. But in these last times when He was made flesh, that is united to flesh, having a rational soul, He is said to be born of a woman after the flesh. Yet is this sacrament in a manner brought out like to birth among us; for the mothers of earthly children impart to their nature that flesh that is to be perfected by degrees in the human form; but God sends the life into the animal. But though these are mothers only of the earthly bodies, yet when they bear children, they are said to bear the whole animal, and not a part of it only. Such do we see to have been done in the birth of Emmanuel; the Word of God was born of the substance of His Father; but because He took on Him flesh, making it His own, it is necessary to confess that He was born of a woman according to the flesh. Where seeing He is truly God, how shall any one doubt to call the Holy Virgin the Mother of God?