And this is life eternal, that they might know you the only true God, and Jesus Christ, whom you have sent.
All Commentaries on John 17:3 Go To John 17
Cornelius a Lapide
AD 1637
But this is life eternal, to know Thee the only true God and Jesus Christ whom Thou hast sent. This saying agrees exactly with what precedes. Christ gives the reason for seeking to be glorified. Because this glorification is the knowledge of God and of Christ, which is the only way to eternal life. His argument is this, "Glorify Me, that I may glorify Thee, so that by this glorifying or manifestation they may attain eternal life." For life eternal consists in knowing Thee, and Jesus Christ whom Thou hast sent, in order that they who believe in Him may be saved. For no one can be saved, except by Faith in Christ.
This is life eternal. (1.) S. Thomas (Par. i. Qust. xii4,6 , and par. iii. Qust. iii. art4 , and Contra Gentes iii. cap61 , and elsewhere), understands these words in their formal sense, and hence proves that the essence of beatitude consists in an act of the intellect, not of the will. And he thus explains it, "Glorify Me, that thus the faithful may obtain eternal life, which consists in knowledge, i.e, in the vision of the Father and the Son." (2.) Cajetan and Jansen think that "knowledge" in this place, is the knowledge both of the way and of the country. It therefore does not mean to "see Thee," which is the portion of the Blessed, but to know Thee, which belongs to those who are but on the way. For eternal life begins here by faith, and will afterwards be consummated in sight. (3.) These words must be explained literally in a causal sense. "This is life eternal, i.e, this is the cause of, the way to life eternal, to believe in Thee the only true God, and Jesus Christ whom thou hast sent." See John 3:16, John 6:47. The effect here is put for the cause, as in John 11:25: I am the Resurrection and the Life, i.e, I am the causes or the author of life, and also John 12:50; I know that His commandment is eternal life, i.e, the cause of it, and 1 John 5:4 and S. Cyril (xi16) affirm that faith and the practice of true piety are the root and origin of eternal life. Faith is in truth the beginning of the Beatific Vision. For it produces hope, hope charity, charity good works, by which we obtain eternal life.
Lastly, S. Augustine thus combines these three meanings, "If the knowledge of God is life eternal, the more we advance in this knowledge, the more do we advance in eternal life. But this will be perfect, when there is no more death. There will then be the highest glorifying of God, because there will be the highest glory. But glory is defined thus, as the frequent speaking of a man with praise. But if a man is praised, when credit is given to what is commonly said of him, how shall not God be praised, when He is beheld? "Blessed are they that dwell in Thy house: they will for ever praise Thee"" ( Psalm 84:4).
That they may know Thee, the only true God. Hence the Arians infer that Christ is not true God. In reply, (1.) S. Augustine (in loc.), Bede, and others, connect together Jesus Christ and the Father under the one term "Deity," and interpret thus, As the Father is true God, so is the Son also true God. (See S. Hil. lib. ix. de Isaiah.) The statement would otherwise be imperfect, for if we believed that the Father alone was true God, we could not have anything else to say about Jesus Christ, unless we understood that He was true God also. The Fathers, in fact, infer from this Christ"s Godhead. (2.) S. Chrysostom, Cyril, and others reply that the word "only" does not exclude the Son and the Holy Spirit, but merely idols and false gods. And the meaning is that they may believe in Thee, who art that God, who only is the true God, as is also the Son and the Holy Spirit. That the Son is true God is sufficiently indicated, when it is said that eternal life consists in the knowledge of Him and of the Father alike. For eternal life necessarily consists in (the knowledge of the one supreme and true God. (See S. Ambrose de Fide, v2.) Christ therefore through modesty does not call Himself God, but one sent by the Father, as the Redeemer of the world. For such He was when Incarnate, and made man. And hence we infer that faith in the Incarnation and the Trinity is required in order to salvation. For the Father cannot be fully believed in, apart from the Son and the Holy Spirit, for the Paternity of the Father requires also the breathing forth of the Holy Spirit.
And Jesus Christ, Whom Thou hast sent. Thou wilt say the Holy Spirit is here omitted, and accordingly He is not God. But the word "only" merely excludes the gods of the heathen, who have another nature, and not the Holy Spirit, Who has the same nature as the Father.
But why is the Son alone mentioned, and not the Holy Spirit? (1.) Euthymius replies, Because the time for speaking about Him had not arrived. But Christ had already promised the Holy Spirit to His disciples, and said a great deal about Him. (2.) Ribera thinks that it was in order to maintain the greatness of His origin, and just as the Son attributes everything to the Father, as proceeding from Him, so likewise eternal life is ascribed to our knowing the Father and the Son. And though the Holy Spirit is understood, yet He is not named, because the Father and the Son are the source of His being, whereas He is not the source of any Divine Person, but derived everything from the Father and the Son. See above, John 15:26. (3.) Christ does not mention the Holy Spirit, because He was wholly engaged in enforcing faith in Himself, as God and man. And this specially needed to be inculcated, both because it was a new doctrine, and difficult of belief, and also because it was the basis of all other articles of belief, and moreover because in that belief was involved belief in the Holy Spirit, of whom Christ had already spoken. The Holy Spirit is therefore here understood, because, as S. Augustine says, "He is the Spirit of the Father and of the Song of Solomon ," being the consubstantial Love of them Both.
