Fathers

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What the Fathers say

John 17:3

Eastern Fathers

John Chrysostom

"And this is life eternal, that they might know Thee the only true God, and Jesus Christ whom Thou hast sent." "The only true God," He saith, by way of distinction from those which are not gods; for He was about to send them to the Gentiles. But if they will not allow this, but on account of this word "only" reject the Son from being true God, in this way as they proceed they reject Him from being God at all. For He also saith, "Ye seek not the glory which is from the only God." (c. v. 44.) Well then; shall not the Son be God? …

Homily on the Gospel of John 80 ↗

Athanasius of Alexandria

The one who believes in the Son believes also in the Father, for he believes in what is proper to the Father's essence. And thus the faith is one in one God. And the one who worships and honors the Son, in the Son worships and honors the Father. For the Godhead is one. And therefore the honor is one and the worship is one that is paid to the Father in and through the Son. And the one who worships in this way worships one God. …

Discourses Against the Arians 3.23.6-24.8-9 ↗

Cyril of Alexandria

Are we saying that knowledge is eternal life? Are we saying that to know the one true and living God will suffice to give us complete security for the future without need of anything else? Then how is "faith apart from works dead"? When we speak of faith, we mean the true knowledge of God and nothing else, since knowledge comes by faith. The prophet Isaiah tells us this: "If you do not believe, neither shall you understand." But he is not talking about a knowledge that consists in barren speculations, which is entirely worthless. …

Commentary on the Gospel of John, Book 11 ↗

Western Saints

Augustine of Hippo

"And this," He adds, "is eternal life, that they may know Thee, the only true God, and Jesus Christ, whom Thou hast sent." The proper order of the words is, "That they may know Thee and Jesus Christ, whom Thou hast sent, as the only true God." Consequently, therefore, the Holy Spirit is also understood, because He is the Spirit of the Father and Son, as the substantial and consubstantial love of both. …

Tractates on John 105 ↗

Hilary of Poitiers

And in what eternal life is, He then shews: And this is life eternal, that they might know Thee, the only true God. To know the only true God is life, but this alone does not constitute life. What else then is added? And Jesus Christ whom Thou hast sent. (iv. de Tr. c. 9) The Arians hold, that as the Father is the only true, only just, only wise God, the Son hath no communion of these attributes; for that which is proper to one, cannot be partaken of by another. …

Catena Aurea by Aquinas ↗

Thomas Aquinas

But is the eternal life given to men related to the glory of the Father? Indeed it is, for this is eternal life, that they may know you the only true God, and Jesus Christ whom you have sent, who was sent so that the Father could be glorified by being known by men. Two things need explanation here. First, why he says, this is eternal life, that they may know. Note that strictly speaking, we call those things living which move themselves to their activities. Those things which are only moved by other things are not living, but dead. …

Commentary on John ↗