St. Cyril on the Purpose of the Eucharist

St. Cyril of Alexandria ca. 376-444

Let them then, who of their folly have not yet admitted the faith in Christ, hear, Except ye eat the Flesh of the Son of Man and drink His Blood, ye have no life in you. For wholly destitute of all share and taste of that life which is in sanctification and bliss, do they abide who do not through the mystical Blessing receive Jesus. For He is Life by Nature, inasmuch as He was begotten of a Living Father: no less quickening is His Holy Body also, being in a manner gathered and ineffably united with the all-quickening Word. Wherefore It is accounted His, and is conceived of as One with Him. For, since the Incarnation, it is inseparable; except as regards the knowledge that the Word Which came from God the Father, and the temple from the Virgin, are not indeed the same in nature (for the Body is not consubstantial with the Word from God), yet are they One by that coming-together and ineffable concurrence. And since the Flesh of the Saviour hath become life-giving (as being united to That which is by Nature Life, the Word from God), when we taste It, then have we life in ourselves, we too united to It, as It to the indwelling Word. For this cause also, when He raised the dead, the Saviour is found to have operated, not by word only, or God-befitting commands, but He laid a stress on employing His Holy Flesh as a sort of co-operator unto this, that He might shew that It had the power to give life, and was already made one with Him. For it was in truth His Own Body, and not another’s. And verily when He was raising the little daughter of the chief of the Synagogue saying, Maid, arise, He laid hold of her hand, as it is written, giving life, as God, by His All-Powerful command, and again, giving life through the touch of His Holy Flesh, He shews that there was one kindred operation through both. Yea and when He went into the city called Nain, and one was being carried out dead, the only son of his mother, again He touched the bier, saying, Young man, to thee I say, Arise. And not only to His Word gives He power to give life to the dead, but that He might shew that His Own Body was life-giving (as I have said already), He touches the dead, thereby also infusing life into those already decayed. And if by the touch alone of His Holy Flesh, He giveth life to that which is decayed, how shall we not profit yet more richly by the life-giving Blessing when we also taste It? For It will surely transform into Its own good, i. e., immortality, those who partake of It. (Commentary on John Bk. 4 Chap. II)

For we are made one with each other after the manner already indicated, and we are also made one with God. And in what sense we are made one with Him, the Lord very clearly explained, and to make the benefit of His teaching plain, added the words: I in them, and Thou in Me, that they may be made perfected into one. For the Son dwells in us in a corporeal sense as Man, commingled and united with us by the mystery of the Eucharist; and also in a spiritual sense as God, by the effectual working and grace of His own Spirit, building up our spirit into newness of life, and making us partakers of His Divine Nature. Christ, then, is seen to be the bond of union between us and God the Father; as Man making us, as it were, His branches, and as God by Nature inherent in His own Father. For no otherwise could that nature which is subject to corruption be uplifted into incorruption, but by the coming down to it of That Nature Which is high above all corruption and variableness, lightening the burthen of ever sinking humanity, so that it can attain its own good; and by drawing it into fellowship and intercourse with Itself, well-nigh extricating it from the limitations which suit the creature, and fashioning into conformity with Itself that which is of itself contrary to It. We have, therefore, been made perfect in unity with God the Father, through the mediation of Christ. For by receiving in ourselves, both in a corporeal and spiritual sense, as I said just now, Him that is the Son by Nature, and Who has essential union with the Father, we have been glorified and become partakers in the Nature of the Most High. (ibid., Bk. 10 Chap. XII)