Fathers

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What the Fathers say

John 17:21

Eastern Fathers

John Chrysostom

After having thus spoken concerning their salvation, and their being sanctified by faith and the Sacrifice, He afterwards speaketh of concord, and finally closeth his discourse with this, having begun with it and ended in it. For at the beginning He saith, "A new commandment I give unto you"; and here, "That they all may be one, as Thou, Father, art in Me and I in Thee." Here again the "as" doth not denote exact similarity in their case, (for it was not possible for them in so great a degree,) but only as far as was possible for men. …

Homily on the Gospel of John 82 ↗

Athanasius of Alexandria

The Saviour, then, saying of us, "As Thou, Father, art in Me, and I in Thee, that they too may be one in Us," does not signify that we were to have identity with Him; for this was shewn from the instance of Jonah; but it is a request to the Father, as John has written, that the Spirit should be vouchsafed through Him to those who believe, through whom we are found to be in God, and in this respect to be conjoined in Him. …

Four Discourses Against the Arians, Discourse 3, Chapter 25 ↗

Cyril of Alexandria

Our Lord Jesus Christ, then, prays not for the twelve Apostles alone, but rather for all who were destined in every age to yield to and obey the words that exhort those who hear to receive that sanctification that is through faith, and to that purification which is accomplished in them through partaking of the Spirit.… What, then, is the manner of His prayer? …

Commentary on the Gospel of John, Book 11 ↗

Western Saints

Augustine of Hippo

But why does He say, That the world may believe that Thou hast sent Me? Will the world believe when we shall all be one in the Father and the Son? Is not this unity that peace eternal, which is the reward of faith, rather than faith itself? For though in this life all of us who hold in the same common faith are one, yet even this unity is not a means to belief, but the consequence of it. What means then, That all may be one, that the world may believe? …

Catena Aurea by Aquinas ↗

Ambrose of Milan

No separation, then, is to be made of the Word from God the Father, no separation in power, no separation in wisdom because of the unity of the divine substance. Again, God the Father is in the Son, as we often times find it written, yet not as sanctifying one who lacks sanctification or as filling a void, for the power of God knows no void. Nor, again, is the power of the one increased by the power of the other, for there are not two powers but one power. …

Exposition of the Christian Faith 4.3.36-38 ↗

Jerome

"As we are Father, Son and Holy Spirit, one God," [Jesus might say], "so may they be one people in themselves, that is, like dear children and partakers of the divine nature." Call the church what you will—bride, sister, mother—its assembly is but one and never lacks husband, brother or son. [The church's] faith is one, and it is not defiled by variety of doctrine or divided by heresies. [The church] continues a virgin. Wherever the Lamb goes, it follows him. It alone knows the song of Christ.

Against Jovinianus 2.19 ↗