John 17:23

I in them, and you in me, that they may be made perfect in one; and that the world may know that you have sent me, and have loved them, as you have loved me.
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Cyril of Alexandria

AD 444
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. 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.
4 mins

Knowing this first, that no prophecy of the scripture is of any private interpretation - 2 Peter 1:20

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