CHAPTER XII. That the Son is by Nature One with God His Father, though He says that He received, as by way of grace, His being One with the Father. 22, 23 And the glory which Thou hast given Me I have given unto them; that they may be one, even as We are One: I in them, and Thou in Me, that they may be perfected into one; that the world may know that Thou didst send Me, and lovedst them, even as Thou lovedst Me.

We say, and therein we are justified, that the Only-begotten hath an essential and natural unity with His Father, insomuch as He was both in the true sense begotten, and from Him proceeds, and is in Him: and though He seem in His own Person to have a separate and distinct Being, yet that He is accounted, by reason of His innate identity of Substance, as One with the Father. But since, in His Incarnation, on our behalf, in order to save our souls, He abdicated, as it were, that place which was His at the beginning, I mean His equality with God the Father, and appears to have been in some sort so far removed therefrom as to have stepped outside His invisible glory, for this is what is meant by the expression, He made Himself of no reputation, He that of old and from the very beginning was enthroned with the Father, receives this as a gift when in the Flesh; His earthy and mortal frame and human form, which was actually part of His Nature, of necessity requiring as a gift that which was His by Nature; for He was and is in the form of the Father, and in equality with Him. Though, therefore, the flesh from a woman's womb, that temple wherewith the Virgin endowed Him, was not in any wise consubstantial with God the Father, nor of like Nature with Him; yet, when once received into the Body of the Word, henceforth it was accounted as One with Him. For Christ is One, and the Son is One, even when He became Man. In this aspect of His Person He is conceived of as taken into union with the Father, being admitted thereto even in the Flesh, which originally enjoys not union with God. And, to speak more concisely and clearly, the Only-begotten says, that that which was given unto Him was given to His Flesh; given too, of course, wholly by the Father, through Himself, in the Spirit. For in no other way than this can union with God be effected, even in the case of Christ Himself, so far as He manifested Himself as, and indeed became, Man. The flesh, that is, was sanctified by union with the Spirit, the twain coming together in an ineffable way; and so unconfusedly attains to God the Word, and through Him to the Father, in habit of mind, that is, and not in any physical sense. This favour and glory then, He says, given unto Me, O Father, by Thee, that is, the glory of being One with Thee, I have given unto them, that they may be one, even as We are One.

CyrJn 11.12.1

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.

CyrJn 11.12.2

When Christ desires us to be admitted to union with God the Father, He at the same time calls down upon our nature this blessing from the Father, and also declares that the power which the grace confers will be a convincing refutation of those who think that He is not from God. For what ground will there be any longer for this false accusation, if of Himself He exalts to union with the Father those who have been brought near to Him through faith and sincere love? When, then, O Father, they gain union with Thee, through Me, then the world will know that Thou didst send Me; that is, that I came to succour the earth by Thy lovingkindness, and to work out the salvation of those who err therein. Besides, none the less, He says, will they know, who have partaken of a grace so acceptable, that Thou lovedst them, even as Thou lovedst Me. For surely He that received into union with Himself Him that is Man, even as we are, that is, Christ, and deemed Him worthy of so great love (we are arguing here concerning Christ as Man), and gave to us the chance of gaining this blessing, surely He would speak of His love as dealt out to us in equal measure. And let not any attentive hearer be perplexed hereby. For it is clear beyond dispute, that the servant can never vie with his master, and that the Father will not give as full a measure of His love to His creatures, as to His own Son. But we must consider that we are here looking upon Him That is beloved from everlasting, as commencing to be loved when He became Man. What, therefore, He then, as it were, took and received, we shall find that He took not for Himself, but for us. For just as, when He lived again after subduing the power of death, He accomplished not His Resurrection for Himself, for He is the Word and God, but gave us this blessing through Himself, and in Himself (for man's nature was in Christ in its entirety, fast bound by the chains of death); in like manner we must suppose that He received the Father's love, not for Himself, because He was continually beloved of Him from the beginning, but rather He accepts it at His Hands upon His Incarnation, that He may call down upon us the Father's love. Just as, then, we shall be, nay, we are even now, as in Christ first the Firstfruits of our race, made conformable to His Resurrection and His glory, even so are we, as it were, like Him; beloved, but yielding the supremacy in all things to the Only-begotten, and justly marvelling at the incomparable mercy of God, shown towards us; Who showers, as it were, upon us the things that are His, and shares with His creatures what appertains to Himself alone.

CyrJn 11.12.3