Early Church Fathers Scripture Index : Texts

John 17:3

There are 51 footnotes for this reference.

Ante-Nicene Fathers, Volume 1, page 110, footnote 14 (Image)

Apostolic Fathers, Justin Martyr, Irenaeus

Ignatius (HTML)

Epistle to the Antiochians (HTML)

Chapter IV.—Continuation. (HTML)
CCEL Footnote 1229 (In-Text, Margin)

The Evangelists, too, when they declared that the one Father was “the only true God,”[John 17:3] did not omit what concerned our Lord, but wrote: “In the beginning was the Word, and the Word was with God, and the Word was God. The same was in the beginning with God. All things were made by Him, and without Him was not anything made that was made.” And concerning the incarnation: “The Word,” says [the Scripture], “became flesh, and dwelt among us.” And again: “The book of the generation of Jesus Christ, the son of David, the son of Abraham.” And ...

Ante-Nicene Fathers, Volume 1, page 463, footnote 3 (Image)

Apostolic Fathers, Justin Martyr, Irenaeus

Irenæus (HTML)

Against Heresies: Book IV (HTML)

Chapter I.—The Lord acknowledged but one God and Father. (HTML)
CCEL Footnote 3806 (In-Text, Margin)

2. Now to whom is it not clear, that if the Lord had known many fathers and gods, He would not have taught His disciples to know [only] one God,[John 17:3] and to call Him alone Father? But He did the rather distinguish those who by word merely (verbo tenus) are termed gods, from Him who is truly God, that they should not err as to His doctrine, nor understand one [in mistake] for another. And if He did indeed teach us to call one Being Father and God, while He does from time to time Himself confess other fathers and gods in the same sense, then He will appear to enjoin ...

Ante-Nicene Fathers, Volume 5, page 383, footnote 7 (Image)

Hippolytus, Cyprian, Caius, Novatian, Appendix

Cyprian. (HTML)

The Epistles of Cyprian. (HTML)

To Jubaianus, Concerning the Baptism of Heretics. (HTML)
CCEL Footnote 2870 (In-Text, Margin)

... unless they believed on the Son whom He had sent. For they who know God the Father the Creator, ought also to know Christ the Son, lest they should flatter and applaud themselves about the Father alone, without the acknowledgment of His Son, who also said, “No man cometh to the Father but by me.” But He, the same, sets forth, that it is the knowledge of the two which saves, when He says, “And this is life eternal, that they might know Thee, the only true God, and Jesus Christ, whom thou hast sent.”[John 17:3] Since, therefore, from the preaching and testimony of Christ Himself, the Father who sent must be first known, then afterwards Christ, who was sent, and there cannot be a hope of salvation except by knowing the two together; how, when God the Father ...

Ante-Nicene Fathers, Volume 5, page 455, footnote 4 (Image)

Hippolytus, Cyprian, Caius, Novatian, Appendix

Cyprian. (HTML)

The Treatises of Cyprian. (HTML)

On the Lord's Prayer. (HTML)
CCEL Footnote 3376 (In-Text, Margin)

... learned and unlearned, published to every sex and every age the precepts of salvation, He made a large compendium of His precepts, that the memory of the scholars might not be burdened in the celestial learning, but might quickly learn what was necessary to a simple faith. Thus, when He taught what is life eternal, He embraced the sacrament of life in a large and divine brevity, saying, “And this is life eternal, that they might know Thee, the only and true God, and Jesus Christ, whom Thou hast sent.”[John 17:3] Also, when He would gather from the law and the prophets the first and greatest commandments, He said, “Hear, O Israel; the Lord thy God is one God: and thou shalt love the Lord thy God with all thy heart, and with all thy mind, and with all thy ...

Ante-Nicene Fathers, Volume 5, page 464, footnote 9 (Image)

Hippolytus, Cyprian, Caius, Novatian, Appendix

Cyprian. (HTML)

The Treatises of Cyprian. (HTML)

An Address to Demetrianus. (HTML)
CCEL Footnote 3444 (In-Text, Margin)

... worshipped by us; but know that this is the judgment of God’s anger, that He who is not acknowledged on account of His benefits may at least be acknowledged through His judgments. Seek the Lord even late; for long ago, God, forewarning by His prophet, exhorts and says, “Seek ye the Lord, and your soul shall live.” Know God even late; for Christ at His coming admonishes and teaches this, saying, “This is life eternal, that they might know Thee, the only true God, and Jesus Christ, whom Thou hast sent.”[John 17:3] Believe Him who deceives not at all. Believe Him who foretold that all these things should come to pass. Believe Him who will give to all that believe the reward of eternal life. Believe Him who will call down on them that believe not, eternal ...

Ante-Nicene Fathers, Volume 5, page 498, footnote 13 (Image)

Hippolytus, Cyprian, Caius, Novatian, Appendix

Cyprian. (HTML)

The Treatises of Cyprian. (HTML)

Exhortation to Martyrdom, Addressed to Fortunatus. (HTML)
That God alone must be worshipped. (HTML)
CCEL Footnote 3714 (In-Text, Margin)

... Gospel, makes mention of the first and second commandment, saying, “Hear, O Israel, The Lord thy God is one God;” and, “Thou shalt love thy Lord with all thy heart, and with all thy soul, and with all thy strength. This is the first; and the second is like unto it, Thou shalt love thy neighbour as thyself. On these two commandments hang all the law and the prophets.” And once more: “And this is life eternal, that they may know Thee, the only and true God, and Jesus Christ, whom Thou hast sent.”[John 17:3]

Ante-Nicene Fathers, Volume 5, page 516, footnote 3 (Image)

Hippolytus, Cyprian, Caius, Novatian, Appendix

Cyprian. (HTML)

The Treatises of Cyprian. (HTML)

Three Books of Testimonies Against the Jews. (HTML)
Book II. (HTML)
That Christ is the First-born, and that He is the Wisdom of God, by whom all things were made. (HTML)CCEL Footnote 3933 (In-Text, Margin)

... my precepts, I will visit their wickednesses with a rod, and their sins with scourges; but my mercy will I not scatter away from them.” Also in the Gospel according to John, the Lord says: “And this is life eternal, that they should know Thee, the only and true God, and Jesus Christ, whom Thou hast sent. I have glorified Thee on the earth: I have finished the work which Thou gavest me to do. And now, do Thou glorify me with Thyself, with the glory which I had with Thee before the world was made.”[John 17:3-5] Also Paul to the Colossians: “Who is the image of the invisible God, and the first-born of every creature.” Also in the same place: “The first-born from the dead, that He might in all things become the holder of the pre-eminence.” In the Apocalypse ...

Ante-Nicene Fathers, Volume 5, page 626, footnote 1 (Image)

Hippolytus, Cyprian, Caius, Novatian, Appendix

Novatian. (HTML)

A Treatise of Novatian Concerning the Trinity. (HTML)

Again from the Gospel He Proves Christ to Be God. (HTML)
CCEL Footnote 5132 (In-Text, Margin)

... the Paraclete being found to be in this economy less than Christ, and taking from Him what He gives to others; seeing that if Christ were only man, Christ would receive from the Paraclete what He should say, not the Paraclete receive from Christ what He should declare. If Christ was only man, wherefore did He lay down for us such a rule of believing as that in which He said, “And this is life eternal, that they should know Thee, the only and true God, and Jesus Christ, whom Thou hast sent?”[John 17:3] Had He not wished that He also should be understood to be God, why did He add, “And Jesus Christ, whom Thou hast sent,” except because He wished to be received as God also? Because if He had not wished to be understood to be God, He would have ...

Ante-Nicene Fathers, Volume 5, page 637, footnote 13 (Image)

Hippolytus, Cyprian, Caius, Novatian, Appendix

Novatian. (HTML)

A Treatise of Novatian Concerning the Trinity. (HTML)

Moreover, Against the Sabellians He Proves that the Father is One, the Son Another. (HTML)
CCEL Footnote 5224 (In-Text, Margin)

... with Thee before the world was made?” Or when it was said by the same: “Father, I knew that Thou hearest me always; but on account of those who stand around I said it, that they may believe that Thou hast sent me?” Or when the definition of the rule is established by Christ Himself, and it is said: “And this is life eternal, that they should know Thee, the only and true God, and Jesus Christ, whom Thou hast sent. I have glorified Thee upon the earth, I have finished the work which Thou gavest me?”[John 17:3-4] Or when, moreover, by the same it is asserted and said: “All things are delivered to me by my Father?” Or when the session at the right hand of the Father is proved both by apostles and prophets? And I should have enough to do were I to endeavour to ...

Ante-Nicene Fathers, Volume 6, page 446, footnote 12 (Image)

Gregory Thaumaturgus, Dionysius the Great, Julius Africanus, Anatolius and Minor Writers, Methodius, Arnobius

Arnobius. (HTML)

The Seven Books of Arnobius Against the Heathen. (Adversus Gentes.) (HTML)

Book II. (HTML)
Chapter XXXII. (HTML)
CCEL Footnote 3617 (In-Text, Margin)

32. Since these things are so, and we have been taught by the greatest teacher that souls are set not far from the gaping jaws of death; that they can, nevertheless, have their lives prolonged by the favour and kindness of the Supreme Ruler if only they try and study to know Him,—for the knowledge of Him is a kind of vital leaven[John 17:3] and cement to bind together that which would otherwise fly apart,—let them, then, laying aside their savage and barbarous nature, return to gentler ways, that they may be able to be ready for that which shall be given. What reason is there that we should be considered by you brutish, as it were, and stupid, if we have yielded and ...

Ante-Nicene Fathers, Volume 7, page 131, footnote 2 (Image)

Lactantius, Venantius, Asterius, Victorinus, Dionysius, Apostolic Teaching and Constitutions, 2 Clement, Early Liturgies

Lactantius (HTML)

The Divine Institutes (HTML)

Book IV. Of True Wisdom and Religion (HTML)
Chap. XXVIII.—Of hope and true religion, and of superstition (HTML)
CCEL Footnote 871 (In-Text, Margin)

And since these things are so, as we have shown, it is plain that no other hope of life is set before man, except that, laying aside vanities and wretched error, he should know God,[John 17:3] and serve God; except he renounce this temporary life, and train himself by the principles of righteousness for the cultivation of true religion. For we are created on this condition, that we pay just and due obedience to God who created us, that we should know and follow Him alone. We are bound and tied to God by this chain of piety; from which religion itself received its name, not, ...

Ante-Nicene Fathers, Volume 7, page 172, footnote 3 (Image)

Lactantius, Venantius, Asterius, Victorinus, Dionysius, Apostolic Teaching and Constitutions, 2 Clement, Early Liturgies

Lactantius (HTML)

The Divine Institutes (HTML)

Book VI. Of True Worship (HTML)
Chap. IX.—Of the law and precept of god; of mercy, and the error of the philosophers (HTML)
CCEL Footnote 1145 (In-Text, Margin)

... can bestow these except God, who has proposed to us virtue itself? Therefore the sum and substance of everything is contained in the acknowledging and worship of God; all the hope and safety of man centres in this; this is the first step of wisdom, to know who is our true Father, and to worship Him alone with the piety which is due to Him, to obey Him, to yield ourselves to His service with the utmost devotedness: let our entire acting, and care, and attention, be laid out in gaining His favour.[John 17:3]

Ante-Nicene Fathers, Volume 7, page 259, footnote 3 (Image)

Lactantius, Venantius, Asterius, Victorinus, Dionysius, Apostolic Teaching and Constitutions, 2 Clement, Early Liturgies

Lactantius (HTML)

A Treatise on the Anger of God Addressed to Donatus (HTML)

Chap. II.—Of the truth and its steps, and of God (HTML)
CCEL Footnote 1635 (In-Text, Margin)

... the eyes are darkened by the brightness of the truth, they who are unable to maintain a firm step fall back to the level ground. Now the first step is to understand false religions, and to throw aside the impious worship of gods which are made by the hand of man. But the second step is to perceive with the mind that there is but one Supreme God, whose power and providence made the world from the beginning, and afterwards continues to govern it. The third step is to know His Servant and Messenger,[John 17:3] whom He sent as His ambassador to the earth, by whose teaching being freed from the error in which we were held entangled, and formed to the worship of the true God, we might learn righteousness. From all of these steps, as I have said, there is a ...

Ante-Nicene Fathers, Volume 7, page 446, footnote 10 (Image)

Lactantius, Venantius, Asterius, Victorinus, Dionysius, Apostolic Teaching and Constitutions, 2 Clement, Early Liturgies

Constitutions of the Holy Apostles (HTML)

Book V (HTML)

Sec. III.—On Feast Days and Fast Days (HTML)
CCEL Footnote 3105 (In-Text, Margin)

... heard not. But to you, the converted of the Gentiles, is the kingdom given, because you, who knew not God, have believed by preaching, and “have known Him, or rather are known of Him,” through Jesus, the Saviour and Redeemer of those that hope in Him. For ye are translated from your former vain and tedious mode of life and have contemned the lifeless idols, and despised the demons, which are in darkness, and have run to the “true light,” and by it have “known the one and only true God and Father,”[John 17:3] and so are owned to be heirs of His kingdom. For since ye have “been baptized into the Lord’s death,” and into His resurrection, as “new-born babes,” ye ought to be wholly free from all sinful actions; “for you are not your own, but His that bought ...

Ante-Nicene Fathers, Volume 7, page 460, footnote 13 (Image)

Lactantius, Venantius, Asterius, Victorinus, Dionysius, Apostolic Teaching and Constitutions, 2 Clement, Early Liturgies

Constitutions of the Holy Apostles (HTML)

Book VI (HTML)

Sec. IV.—Of the Law (HTML)
CCEL Footnote 3292 (In-Text, Margin)

XXIII. For He did not take away the law of nature, but confirmed it. For He that said in the law, “The Lord thy God is one Lord;” the same says in the Gospel, “That they might know Thee, the only true God.”[John 17:3] And He that said, “Thou shalt love thy neighbour as thyself,” says in the Gospel, renewing the same precept, “A new commandment I give unto you, that ye love one another.” He who then forbade murder, does now forbid causeless anger. He that forbade adultery, does now forbid all unlawful lust. He that forbade stealing, now pronounces him most happy who supplies those that are in ...

Ante-Nicene Fathers, Volume 9, page 116, footnote 22 (Image)

Gospel of Peter, Diatessaron, Apocalypses, Visio Pauli, Testament of Abraham, Acts of X/P, Zosimus, Aristides, Clement, Origen

The Diatessaron of Tatian. (HTML)

The Diatessaron. (HTML)

Section XLVII. (HTML)
CCEL Footnote 3276 (In-Text, Margin)

[19] This said Jesus, and lifted up his eyes unto heaven, and said, My Father, the hour [20] is come; glorify thy Son, that thy Son may glorify thee: as thou gavest him authority [21] over all flesh, that all that thou hast given him, he might give them eternal life.[John 17:3] And this is eternal life, that they should know that thou alone art true God, and that he [22] [Arabic, p. 179] whom thou didst send is Jesus the Messiah. I glorified thee in the earth, [23] and the work which thou gavest me to do I have accomplished. And now glorify thou me, O Father, beside thee, with that glory which I had with thee [24] before the ...

Ante-Nicene Fathers, Volume 9, page 323, footnote 1 (Image)

Gospel of Peter, Diatessaron, Apocalypses, Visio Pauli, Testament of Abraham, Acts of X/P, Zosimus, Aristides, Clement, Origen

Epistle to Gregory and Origen's Commentary on the Gospel of John. (HTML)

Origen's Commentary on the Gospel of John. (HTML)

Book II. (HTML)
In What Way the Logos is God.  Errors to Be Avoided on This Question. (HTML)
CCEL Footnote 4665 (In-Text, Margin)

... wicked. Either they deny that the Son has a distinct nature of His own besides that of the Father, and make Him whom they call the Son to be God all but the name, or they deny the divinity of the Son, giving Him a separate existence of His own, and making His sphere of essence fall outside that of the Father, so that they are separable from each other. To such persons we have to say that God on the one hand is Very God (Autotheos, God of Himself); and so the Saviour says in His prayer to the Father,[John 17:3] “That they may know Thee the only true God;” but that all beyond the Very God is made God by participation in His divinity, and is not to be called simply God (with the article), but rather God (without article). And thus the first-born of all ...

Nicene and Post-Nicene Fathers, Series 1, Volume 3, page 26, footnote 7 (Image)

Augustine: On the Holy Trinity, Doctrinal Treatises, Moral Treatises

Doctrinal Treatises of St. Augustin (HTML)

On the Holy Trinity. (HTML)

The unity and equality of the Trinity are demonstrated out of the Scriptures; and the true interpretation is given of those texts which are wrongly alleged against the equality of the Son. (HTML)
The Texts of Scripture Explained Respecting the Subjection of the Son to the Father, Which Have Been Misunderstood. Christ Will Not So Give Up the Kingdom to the Father, as to Take It Away from Himself. The Beholding Him is the Promised End of All Actions. The Holy Spirit is Sufficient to Our Blessedness Equally with the Father. (HTML)
CCEL Footnote 82 (In-Text, Margin)

... “we are the sons of God; and it doth not yet appear what we shall be: but we know that, when He shall appear, we shall be like Him; for we shall see Him as He is.” For that which He said to His servant Moses, “I am that I am; thus shalt thou say to the children of Israel, I Am hath sent me to you;” this it is which we shall contemplate when we shall live in eternity. For so it is said, “And this is life eternal, that they might know Thee, the only true God, and Jesus Christ, whom Thou hast sent.”[John 17:3] This shall be when the Lord shall have come, and “shall have brought to light the hidden things of darkness;” when the darkness of this present mortality and corruption shall have passed away. Then will be our morning, which is spoken of in the ...

Nicene and Post-Nicene Fathers, Series 1, Volume 3, page 35, footnote 2 (Image)

Augustine: On the Holy Trinity, Doctrinal Treatises, Moral Treatises

Doctrinal Treatises of St. Augustin (HTML)

On the Holy Trinity. (HTML)

The unity and equality of the Trinity are demonstrated out of the Scriptures; and the true interpretation is given of those texts which are wrongly alleged against the equality of the Son. (HTML)
Diverse Things are Spoken Concerning the Same Christ, on Account of the Diverse Natures of the One Hypostasis [Theanthropic Person]. Why It is Said that the Father Will Not Judge, But Has Given Judgment to the Son. (HTML)
CCEL Footnote 188 (In-Text, Margin)

... they that have done evil, unto the resurrection of damnation.” For this purpose, then, it was necessary that He should therefore receive that power, because He is the Son of man, in order that all in rising again might see Him in the form in which He can be seen by all, but by some to damnation, by others to life eternal. And what is life eternal, unless that sight which is not granted to the ungodly? “That they might know Thee,” He says, “the One true God, and Jesus Christ, whom Thou hast sent.”[John 17:3] And how are they to know Jesus Christ Himself also, unless as the One true God, who will show Himself to them; not as He will show Himself, in the form of the Son of man, to those also that shall be punished?

Nicene and Post-Nicene Fathers, Series 1, Volume 3, page 36, footnote 2 (Image)

Augustine: On the Holy Trinity, Doctrinal Treatises, Moral Treatises

Doctrinal Treatises of St. Augustin (HTML)

On the Holy Trinity. (HTML)

The unity and equality of the Trinity are demonstrated out of the Scriptures; and the true interpretation is given of those texts which are wrongly alleged against the equality of the Son. (HTML)
Diverse Things are Spoken Concerning the Same Christ, on Account of the Diverse Natures of the One Hypostasis [Theanthropic Person]. Why It is Said that the Father Will Not Judge, But Has Given Judgment to the Son. (HTML)
CCEL Footnote 204 (In-Text, Margin)

... the foundation of the world. For, as He will say to those, “Depart into everlasting fire;” so to these, “Come, ye blessed of my Father, inherit the kingdom prepared for you.” And as those will go into everlasting burning; so the righteous will go into life eternal. But what is life eternal, except “that they may know Thee,” He says, “the One true God, and Jesus Christ, whom Thou hast sent?” but know Him now in that glory of which He says to the Father, “Which I had with Thee before the world was.”[John 17:3-5] For then He will deliver up the kingdom to God, even the Father, that the good servant may enter into the joy of his Lord, and that He may hide those whom God keeps in the hiding of His countenance from the confusion of men, namely, of those men who ...

Nicene and Post-Nicene Fathers, Series 1, Volume 3, page 82, footnote 1 (Image)

Augustine: On the Holy Trinity, Doctrinal Treatises, Moral Treatises

Doctrinal Treatises of St. Augustin (HTML)

On the Holy Trinity. (HTML)

Augustin explains for what the Son of God was sent; but, however, that the Son of God, although made less by being sent, is not therefore less because the Father sent Him; nor yet the Holy Spirit less because both the Father sent Him and the Son. (HTML)
The Son of God Became Incarnate in Order that We Being Cleansed by Faith May Be Raised to the Unchangeable Truth. (HTML)
CCEL Footnote 528 (In-Text, Margin)

... truth follows faith, so eternity may follow upon mortality. And therefore, since our faith will become truth, when we have attained to that which is promised to us who believe: and that which is promised us is eternal life; and the Truth (not that which shall come to be according as our faith shall be, but that truth which is always, because in it is eternity,—the Truth then) has said, “And this is life eternal, that they might know Thee the only true God, and Jesus Christ, whom Thou hast sent:”[John 17:3] when our faith by seeing shall come to be truth, then eternity shall possess our now changed mortality. And until this shall take place, and in order that it may take place,—because we adapt the faith of belief to things which have a beginning, as ...

Nicene and Post-Nicene Fathers, Series 1, Volume 3, page 102, footnote 1 (Image)

Augustine: On the Holy Trinity, Doctrinal Treatises, Moral Treatises

Doctrinal Treatises of St. Augustin (HTML)

On the Holy Trinity. (HTML)

In reply to the argument alleged against the equality of the Son from the apostle’s words, saying that Christ is the ‘power of God and the wisdom of God,’ he propounds the question whether the Father Himself is not wisdom. But deferring for a while the answer to this, he adduces further proof of the unity and equality of the Father, the Son, and the Holy Spirit; and that God ought to be said and believed to be a Trinity, not triple (triplicem). And he adds an explanation of the saying of Hilary—Eternity in the Father, Appearance in the Image, and Use in the Gift. (HTML)
Whether One or the Three Persons Together are Called the Only God. (HTML)
CCEL Footnote 619 (In-Text, Margin)

... and the Holy Spirit. For if any one should ask whether the Father alone is God, how can it be replied that He is not, unless perhaps we were to say that the Father indeed is God, but that He is not God alone, but that the Father, Son, and Holy Spirit are God alone? But then what shall we do with that testimony of the Lord? For He was speaking to the Father, and had named the Father as Him to whom He was speaking, when He says, “And this is life eternal, that they may know Thee the one true God.”[John 17:3] And this the Arians indeed usually take, as if the Son were not true God. Passing them by, however, we must see whether, when it is said to the Father, “That they may know Thee the one true God,” we are forced to understand it as if He wished to ...

Nicene and Post-Nicene Fathers, Series 1, Volume 3, page 197, footnote 9 (Image)

Augustine: On the Holy Trinity, Doctrinal Treatises, Moral Treatises

Doctrinal Treatises of St. Augustin (HTML)

On the Holy Trinity. (HTML)

He speaks of the true wisdom of man, viz. that by which he remembers, understands, and loves God; and shows that it is in this very thing that the mind of man is the image of God, although his mind, which is here renewed in the knowledge of God, will only then be made the perfect likeness of God in that image when there shall be a perfect sight of God. (HTML)
John is Rather to Be Understood of Our Perfect Likeness with the Trinity in Life Eternal. Wisdom is Perfected in Happiness. (HTML)
CCEL Footnote 935 (In-Text, Margin)

... see Him as He is.” For this gift will be given to us at that time, when it shall have been said, “Come, ye blessed of my Father, inherit the kingdom prepared for you.” For then will the ungodly be taken away, so that he shall not see the glory of the Lord, when those on the left hand shall go into eternal punishment, while those on the right go into life eternal. But “this is eternal life,” as the Truth tells us; “to know Thee,” He says, “the one true God, and Jesus Christ whom Thou hast sent.”[John 17:3]

Nicene and Post-Nicene Fathers, Series 1, Volume 4, page 54, footnote 11 (Image)

Augustine: The Anti-Manichaean Writings, The Anti-Donatist Writings

Writings in Connection with the Manichæan Controversy. (HTML)

On the Morals of the Catholic Church. (HTML)

Four Moral Duties Regarding the Love of God, of Which Love the Reward is Eternal Life and the Knowledge of the Truth. (HTML)
CCEL Footnote 125 (In-Text, Margin)

... contains the whole reward in the promise of which we rejoice; nor can the reward precede desert, nor be given to a man before he is worthy of it. What can be more unjust than this, and what is more just than God? We should not then demand the reward before we deserve to get it. Here, perhaps, it is not out of place to ask what is eternal life; or rather let us hear the Bestower of it: "This," He says, "is life eternal, that they should know Thee, the true God, and Jesus Christ whom Thou hast sent."[John 17:3] So eternal life is the knowledge of the truth. See, then, how perverse and preposterous is the character of those who think that their teaching of the knowledge of God will make us perfect, when this is the reward of those already perfect! What ...

Nicene and Post-Nicene Fathers, Series 1, Volume 4, page 101, footnote 1 (Image)

Augustine: The Anti-Manichaean Writings, The Anti-Donatist Writings

Writings in Connection with the Manichæan Controversy. (HTML)

On Two Souls, Against the Manichæans. (HTML)

The Manichæans Inquire Whence is Evil and by This Question Think They Have Triumphed.  Let Them First Know, Which is Most Easy to Do, that Nothing Can Live Without God.  Consummate Evil Cannot Be Known Except by the Knowledge of Consummate Good, Which is God. (HTML)
CCEL Footnote 207 (In-Text, Margin)

... higher. But God is good and than Him nothing can be higher. God therefore is the highest good. Let us therefore together so recognize God, and thus what we seek too hastily will not be hidden from us. Do you suppose then that the knowledge of God is a matter of small account or desert. For what other reward is there for us than life eternal, which is to know God? For God the Master says: "But this is life eternal, that they might know Thee the only and true God, and Jesus Christ whom thou hast sent."[John 17:3] For the soul, although it is immortal, yet because aversion from the knowledge of God is rightly called its death, when it is converted to God, the reward of eternal life to be attained is that knowledge; so that this is, as has been said, eternal ...

Nicene and Post-Nicene Fathers, Series 1, Volume 5, page 98, footnote 16 (Image)

Augustine: Anti-Pelagian Writings

A Treatise on the Spirit and the Letter. (HTML)

The Eternal Reward. (HTML)

CCEL Footnote 875 (In-Text, Margin)

... my people.” This corresponds to the Psalmist’s words to God: “It is good for me to hold me fast by God.” “I will be,” says God, “their God, and they shall be my people.” What is better than this good, what happier than this happiness,—to live to God, to live from God, with whom is the fountain of life, and in whose light we shall see light? Of this life the Lord Himself speaks in these words: “This is life eternal that they may know Thee the only true God, and Jesus Christ whom Thou hast sent,”[John 17:3] —that is, “Thee and Jesus Christ whom Thou hast sent,” the one true God. For no less than this did Himself promise to those who love Him: “He that loveth me, keepeth my commandments; and he that loveth me shall be loved of my Father, and I will love ...

Nicene and Post-Nicene Fathers, Series 1, Volume 5, page 98, footnote 20 (Image)

Augustine: Anti-Pelagian Writings

A Treatise on the Spirit and the Letter. (HTML)

The Eternal Reward. (HTML)

CCEL Footnote 879 (In-Text, Margin)

... him” —in the form, no doubt, of God, wherein He is equal to the Father; not in the form of a servant, for in this He will display Himself even to the wicked also. Then, however, shall that come to pass which is written, “Let the ungodly man be taken away, that he see not the glory of the Lord.” Then also shall “the wicked go into everlasting punishment, and the righteous into life eternal.” Now this eternal life, as I have just mentioned, has been defined to be, that they may know the one true God.[John 17:3] Accordingly John again says: “Beloved, now are we the sons of God; and it doth not yet appear what we shall be: but we know that, when He shall appear, we shall be like Him; for we shall see Him as He is.” This likeness begins even now to be ...

Nicene and Post-Nicene Fathers, Series 1, Volume 5, page 100, footnote 6 (Image)

Augustine: Anti-Pelagian Writings

A Treatise on the Spirit and the Letter. (HTML)

The Law Written in the Heart, and the Reward of the Eternal Contemplation of God, Belong to the New Covenant; Who Among the Saints are the Least and the Greatest. (HTML)

CCEL Footnote 902 (In-Text, Margin)

... required,—that is, a multiplicity of expressions, since it is by different ones that different things are suggested to him who does not as yet contemplate with a perfectly purified mind the everlasting light of transparent truth. “When that, however, which is perfect is come, then that which is in part shall be done away,” then, what appeared to the flesh in assumed flesh shall display Itself as It is in Itself to all who love It; then, there shall be eternal life for us to know the one very God;[John 17:3] then shall we be like Him, because “we shall then know, even as we are known;” then “they shall teach no more every man his neighbour, and every man his brother, saying, Know the Lord; for they shall all know me, from the least unto the greatest of ...

Nicene and Post-Nicene Fathers, Series 1, Volume 5, page 110, footnote 9 (Image)

Augustine: Anti-Pelagian Writings

A Treatise on the Spirit and the Letter. (HTML)

Mercy and Pity in the Judgment of God. (HTML)

CCEL Footnote 1062 (In-Text, Margin)

... right hand, to whom, it is said, “I was an hungered, and ye gave me meat.” There will, however, be also “judgment without mercy;” but it will be for him “that hath not showed mercy.” But “blessed are the merciful: for they shall obtain mercy” of God. Then, as soon as those on the left hand shall have gone into eternal fire, the righteous, too, shall go into everlasting life, because He says: “This is life eternal, that they may know Thee the only true God, and Jesus Christ whom Thou hast sent.”[John 17:3] And with this knowledge, this vision, this contemplation, shall the desire of their soul be satisfied; for it shall be enough for it to have this and nothing else,—there being nothing more for it to desire, to aspire to, or to require. It was with a ...

Nicene and Post-Nicene Fathers, Series 1, Volume 6, page 490, footnote 7 (Image)

Augustine: Sermon on the Mount, Harmony of the Gospels, Homilies on the Gospels

Sermons on Selected Lessons of the New Testament. (HTML)

On the words of the Gospel, John v. 25,’Verily, verily, I say unto you, the hour cometh, and now is, when the dead shall hear the voice of the son of God; and they that hear shall live,’ etc.; and on the words of the apostle, ‘things which eye saw not,’ etc., 1 Cor. ii. 9. (HTML)

CCEL Footnote 3809 (In-Text, Margin)

... the body, when “the ungodly shall be taken away that he see not the Glory of God.” For then “when He shall appear, we shall be like Him; for we shall see Him as He is.” This is life eternal. For all that we said before is nothing to that life. That we live, what is it? That we are in health, what is it? That we shall see God, is a great thing. This is life eternal; this Himself hath said, “But this is life eternal, that they may know Thee the Only True God, and Jesus Christ whom Thou hast sent.”[John 17:3] This is life eternal, that they may know, see, comprehend, acquaint themselves with what they had believed, may perceive that which they were not yet able to comprehend. Then may the mind see what “eye hath not seen, nor ear heard, neither hath it ...

Nicene and Post-Nicene Fathers, Series 1, Volume 7, page 24, footnote 8 (Image)

Augustine: Homilies on the Gospel of John, Homilies on the First Epistle of John, Soliloquies

Lectures or Tractates on the Gospel According to St. John. (HTML)

Chapter I. 15–18. (HTML)

CCEL Footnote 71 (In-Text, Margin)

20. The same things are commanded in the Decalogue as we are commanded to observe; but the same promises are not made as to us. What is promised to us? Life eternal. “And this is life eternal, that they know Thee, the only true God, and Jesus Christ whom Thou hast sent.”[John 17:3] The knowledge of God is promised: that is, grace for grace. Brethren, we now believe, we do not see; for faith the reward will be to see what we believe. The prophets knew this, but it was concealed before He came. For a certain lover sighing, says in the Psalms: “One thing have I desired of the Lord, that will I seek after.” And dost thou ask what he seeks? ...

Nicene and Post-Nicene Fathers, Series 1, Volume 7, page 131, footnote 2 (Image)

Augustine: Homilies on the Gospel of John, Homilies on the First Epistle of John, Soliloquies

Lectures or Tractates on the Gospel According to St. John. (HTML)

Chapter V. 19–30. (HTML)

CCEL Footnote 400 (In-Text, Margin)

... of which He is the head, and deliver up the kingdom of God. Then will openly be seen that form of God which could not be seen by the wicked, to whose vision the form of a servant must be shown. He says also in another place on this wise: “These shall go away into everlasting burning” (speaking of certain on the left), “but the just into life eternal;” of which life He says in another place: “And this is eternal life, that they may know Thee the one true God, and Jesus Christ whom Thou hast sent.”[John 17:3] Then will He be there manifested, “who, being in the form of God, thought it not robbery to be equal with God.” Then He will manifest Himself, as He has promised to manifest Himself to them that love Him. For “he that loveth me,” saith He, “keepeth ...

Nicene and Post-Nicene Fathers, Series 1, Volume 7, page 143, footnote 7 (Image)

Augustine: Homilies on the Gospel of John, Homilies on the First Epistle of John, Soliloquies

Lectures or Tractates on the Gospel According to St. John. (HTML)

Chapter V. 20–23. (HTML)

CCEL Footnote 442 (In-Text, Margin)

... to the end that God may be seen by thee? For “blessed are the pure in heart, for they shall see God.” “But this,” saith the servant, as if disputing with the Lord, “Thou didst not express, when Thou didst say, ‘The righteous shall go into life eternal;’ Thou didst not say, They shall go to see me in the form of God, and to see the Father, with whom I am equal.” Observe what He said elsewhere: “This is life eternal, that they may know Thee the one true God, and Jesus Christ whom Thou hast sent.”[John 17:3]

Nicene and Post-Nicene Fathers, Series 2, Volume 1, page 570, footnote 5 (Image)

Eusebius: Church History from A.D. 1-324, Life of Constantine the Great, Oration in Praise of Constantine

The Life of Constantine with Orations of Constantine and Eusebius. (HTML)

The Oration of Constantine. (HTML)

Of those who are Ignorant of this Mystery; and that their Ignorance is Voluntary. The Blessings which await those who know it, especially such as die in the Confession of the Faith. (HTML)
CCEL Footnote 3434 (In-Text, Margin)

... impatience those precepts which are given for our blessing and advantage. In truth, it was the very choice of men to disregard these precepts, and to turn a deaf ear to the commandments so distasteful to them; though had they listened, they would have gained a reward well worthy such attention, and that not for the present only, but the future life, which is indeed the only true life. For the reward of obedience to God is imperishable and everlasting life, to which they may aspire who know him,[John 17:3] and frame their course of life so as to afford a pattern to others, and as it were a perpetual standard for the imitation of those who desire to excel in virtue. Therefore was the doctrine committed to men of understanding, that the truths which ...

Nicene and Post-Nicene Fathers, Series 2, Volume 1, page 598, footnote 2 (Image)

Eusebius: Church History from A.D. 1-324, Life of Constantine the Great, Oration in Praise of Constantine

The Life of Constantine with Orations of Constantine and Eusebius. (HTML)

The Oration of Eusebius. (HTML)

Chapter XII (HTML)
CCEL Footnote 3545 (In-Text, Margin)

... he who is the supreme Source of good, and Cause of all things, is beyond all comprehension, and therefore inexpressible by word, or speech, or name; surpassing the power, not of language only, but of thought itself. Uncircumscribed by place, or body; neither in heaven, nor in ethereal space, nor in any other part of the universe; but entirely independent of all things else, he pervades the depths of unexplored and secret wisdom. The sacred oracles teach us to acknowledge him as the only true God,[John 17:3] apart from all corporeal essence, distinct from all subordinate ministration. Hence it is said that all things are from him, but not through him.

Nicene and Post-Nicene Fathers, Series 2, Volume 4, page 342, footnote 2 (Image)

Athanasius: Select Writings and Letters

Against the Arians. (Orationes contra Arianos IV.) (HTML)

Against the Arians. (Orationes contra Arianos IV.) (HTML)

Discourse I (HTML)
Texts Explained; Thirdly, Hebrews i. 4. Additional texts brought as objections; e.g. Heb. i. 4; vii. 22. Whether the word 'better' implies likeness to the Angels; and 'made' or 'become' implies creation. Necessary to consider the circumstances under which Scripture speaks. Difference between 'better' and 'greater;' texts in proof. 'Made' or 'become' a general word. Contrast in Heb. i. 4, between the Son and the Works in point of nature. The difference of the punishments under the two Covenants shews the difference of the natures of the Son and the Angels. 'Become' relates not to the nature of the Word, but to His manhood and office and relation towards us. Parallel passages in which the term is applied to the Eternal Father. (HTML)
CCEL Footnote 2200 (In-Text, Margin)

... fall.’ This shews moreover that the Son is in the Father and the Father in the Son; for the Father being on the right, the Son is on the right; and while the Son sits on the right of the Father, the Father is in the Son. And the Angels indeed minister ascending and descending; but concerning the Son he saith, ‘And let all the Angels of God worship Him.’ And when Angels minister, they say, ‘I am sent unto thee,’ and, ‘The Lord has commanded;’ but the Son, though He say in human fashion, ‘I am sent[John 17:3],’ and comes to finish the work and to minister, nevertheless says, as being Word and Image, ‘I am in the Father, and the Father in Me;’ and, ‘He that hath seen Me, hath seen the Father;’ and, ‘The Father that abideth in Me, He doeth the works;’ for ...

Nicene and Post-Nicene Fathers, Series 2, Volume 8, page 117, footnote 17 (Image)

Basil: Letters and Select Works

The Letters. (HTML)

To the Cæsareans.  A defence of his withdrawal, and concerning the faith. (HTML)

CCEL Footnote 1805 (In-Text, Margin)

... suggests all these ideas to us. For this reason too before His passion our Lord deprecates the designation of “Jesus Christ,” and charges His disciples to “tell no man that He was Jesus, the Christ.” For His purpose was, after the completion of the œconomy, after His resurrection from the dead, and His assumption into heaven, to commit to them the preaching of Him as Jesus, the Christ. Such is the force of the words “That they may know Thee the only true God and Jesus Christ whom thou hast sent,”[John 17:3] and again “Ye believe in God, believe also in me.” Everywhere the Holy Ghost secures our conception of Him to save us from falling in one direction while we advance in the other, heeding the theology but neglecting the œconomy, and so by omission ...

Nicene and Post-Nicene Fathers, Series 2, Volume 9, page 48, footnote 1 (Image)

Hilary of Poitiers, John of Damascus

Title Page (HTML)

De Trinitate or On the Trinity. (HTML)

De Trinitate or On the Trinity. (HTML)
Book I (HTML)
CCEL Footnote 525 (In-Text, Margin)

... Lord as, Why callest thou Me good? None is good save One, even God. They argue that by His reproof of the man who called Him good, and by His assertion of the goodness of God only, He excludes Himself from the goodness of that God Who alone is good and from that true Divinity which belongs only to One. With this text their blasphemous reasoning connects another, And this is life eternal that they should know Thee the only true God, and Him Whom Thou didst send, Jesus Christ[John 17:3]. Here, they say, He confesses that the Father is the only true God, and that He Himself is neither true nor God, since this recognition of an only true God is limited to the Possessor of the attributes assigned. And they profess to be quite clear ...

Nicene and Post-Nicene Fathers, Series 2, Volume 9, page 73, footnote 4 (Image)

Hilary of Poitiers, John of Damascus

Title Page (HTML)

De Trinitate or On the Trinity. (HTML)

De Trinitate or On the Trinity. (HTML)
Book IV (HTML)
CCEL Footnote 665 (In-Text, Margin)

... the scriptures of the prophets according to the commandment of the eternal God Who is made known unto all nations unto obedience of faith; to the only wise God, through Jesus Christ, to Whom be glory for ever and ever. They argue also that He alone is true, for Isaiah says, They shall bless Thee, the true God, and the Lord Himself has borne witness in the Gospel, saying, And this is life eternal that they should know Thee, the only true God, and Jesus Christ Whom Thou hast sent[John 17:3]. Again they reason that He alone is good, to leave no goodness for the Son, because it has been said through Him, There is none good save One, even God; and that He alone has power, because Paul has said, Which in His own times He shall ...

Nicene and Post-Nicene Fathers, Series 2, Volume 9, page 155, footnote 9 (Image)

Hilary of Poitiers, John of Damascus

Title Page (HTML)

De Trinitate or On the Trinity. (HTML)

De Trinitate or On the Trinity. (HTML)
Book IX (HTML)
CCEL Footnote 966 (In-Text, Margin)

... interpretations on words uttered with other meanings and intentions, they are robbing the Son of His natural unity. Thus to deny the Son of God, they quote the authority of His own words, Why callest thou Me good? None is good, save one, God. These words, they say, proclaim the Oneness of God: anything else, therefore, which shares the name of God, cannot possess the nature of God, for God is One. And from His words, This is life eternal, that they should know Thee the only true God[John 17:3], they attempt to establish the theory that Christ is called God by a mere title, not as being very God. Further, to exclude Him from the proper nature of the true God, they quote, The Son can do nothing of Himself except that which He hath seen ...

Nicene and Post-Nicene Fathers, Series 2, Volume 9, page 156, footnote 4 (Image)

Hilary of Poitiers, John of Damascus

Title Page (HTML)

De Trinitate or On the Trinity. (HTML)

De Trinitate or On the Trinity. (HTML)
Book IX (HTML)
CCEL Footnote 970 (In-Text, Margin)

3. We will offer later an explanation of these texts in the words of the Gospels and Epistles themselves. But first we hold it right to remind the members of our common faith, that the knowledge of the Eternal is presented in the same confession which gives eternal life[John 17:3]. He does not, he cannot know his own life, who is ignorant that Christ Jesus was very God, as He was very man. It is equally perilous, whether we deny that Christ Jesus was God the Spirit, or that He was flesh of our body: Every one therefore who shall confess Me before men, him will I also confess before My Father which is in Heaven. But whosoever shall deny ...

Nicene and Post-Nicene Fathers, Series 2, Volume 9, page 164, footnote 2 (Image)

Hilary of Poitiers, John of Damascus

Title Page (HTML)

De Trinitate or On the Trinity. (HTML)

De Trinitate or On the Trinity. (HTML)
Book IX (HTML)
CCEL Footnote 1010 (In-Text, Margin)

... is none other than He is preached, namely the true God, and abiding in the glory of the one true God. Just as He proclaims Himself Lord out of the law, even when He seems to deny the fact, so in the Gospels He proves Himself the true God, even when He appears to confess the opposite. To escape the acknowledgment that He is the true God, the heretics plead that He said, And this is life eternal, that they should know Thee, the only true God. and Him Whom Thou didst send, even Jesus Christ[John 17:3]. When He says, Thee, the only true God, they think He excludes Himself from the reality of God by the restriction of solitariness; for the only true God cannot be understood except as a solitary God. It is true the Apostolic faith does not ...

Nicene and Post-Nicene Fathers, Series 2, Volume 9, page 168, footnote 1 (Image)

Hilary of Poitiers, John of Damascus

Title Page (HTML)

De Trinitate or On the Trinity. (HTML)

De Trinitate or On the Trinity. (HTML)
Book IX (HTML)
CCEL Footnote 1024 (In-Text, Margin)

39. For this reason, having already so well prepared their minds for the understanding of this belief, the Lord follows up the words, And this is eternal life, that they should know Thee, the only true God, and Him Whom Thou didst send, even Jesus Christ, with a reference to the obedience displayed in His incarnation, I have glorified Thee on the earth, I have accomplished the work which Thou gavest Me to do[John 17:3-4]. And then, that we might know the reward of His obedience, and the secret purpose of the whole divine plan, He continued, And now, O Father, glorify Thou Me with Thine own self, with the glory which I had with Thee before the world was. Does any one deny that Christ remained in ...

Nicene and Post-Nicene Fathers, Series 2, Volume 9, page 169, footnote 2 (Image)

Hilary of Poitiers, John of Damascus

Title Page (HTML)

De Trinitate or On the Trinity. (HTML)

De Trinitate or On the Trinity. (HTML)
Book IX (HTML)
CCEL Footnote 1028 (In-Text, Margin)

... glory of God, but in the glory of God the Father. The Father glorifies Him, not with a glory from without, but in Himself. By taking Him back into that glory, which belongs to Himself, and which He had with Him before, the Father glorifies Him with Himself and in Himself. Therefore this confession is inseparable from Christ even in the humiliation of His manhood, as He says, And this is eternal life, that they should know Thee, the only true God, Him, Whom Thou didst send, even Jesus Christ[John 17:3]; for firstly there is no life eternal in the confession of God the Father without Jesus Christ, and secondly Christ is glorified in the Father. Eternal life is precisely this, to know the only true God and Him, Whom He sent, even Jesus Christ; deny ...

Nicene and Post-Nicene Fathers, Series 2, Volume 9, page 4b, footnote 11 (Image)

Hilary of Poitiers, John of Damascus

John of Damascus: Exposition of the Orthodox Faith. (HTML)

An Exact Exposition of the Orthodox Faith. (HTML)

Book I (HTML)
Proof that God is one and not many. (HTML)
CCEL Footnote 1457 (In-Text, Margin)

... the land of Egypt. Thou shalt have no other Gods before Me. And again He says, Hear, O Israel, the Lord our God is one Lord. And in Isaiah the prophet we read, For I am the first God and I am the last, and beside Me there is no God. Before Me there was not any God, nor after Me will there be any God, and beside Me there is no God. And the Lord, too, in the holy gospels speaketh these words to His Father, And this is life eternal, that they may know Thee the only true God[John 17:3]. But with those that do not believe in the Holy Scriptures we will reason thus.

Nicene and Post-Nicene Fathers, Series 2, Volume 10, page 44, footnote 10 (Image)

Ambrose: Select Works and Letters

Dogmatic Treatises, Ethical Works, and Sermons. (HTML)

On the Duties of the Clergy. (HTML)

Book II. (HTML)
Chapter II. The different ideas of philosophers on the subject of happiness. He proves, first, from the Gospel that it rests on the knowledge of God and the pursuit of good works; next, that it may not be thought that this idea was adopted from the philosophers, he adds proofs from the witness of the prophets. (HTML)
CCEL Footnote 380 (In-Text, Margin)

5. But the sacred Scriptures say that eternal life rests on a knowledge of divine things and on the fruit of good works. The Gospel bears witness to both these statements. For the Lord Jesus spoke thus of knowledge: “This is eternal life, to know Thee, the only true God, and Jesus Christ Whom Thou hast sent.”[John 17:3] About works He gives this answer: “Every one that hath forsaken house, or brethren, or sisters, or father, or mother, or wife, or children, or lands, for My Name’s sake, shall receive an hundred-fold, and shall inherit everlasting life.”

Nicene and Post-Nicene Fathers, Series 2, Volume 10, page 118, footnote 2 (Image)

Ambrose: Select Works and Letters

Dogmatic Treatises, Ethical Works, and Sermons. (HTML)

On the Holy Spirit. (HTML)

Book II. (HTML)
Chapter III. As to know the Father and the Son is life, so is it life to know the Holy Spirit; and therefore in the Godhead He is not to be separated from the Father. (HTML)
CCEL Footnote 1042 (In-Text, Margin)

26. Let them say, then, wherein they think that there is an unlikeness in the divine operation. Since as to know the Father and the Son is life, as the Lord Himself declared, saying: “This is life eternal to know Thee the only true God, and Jesus Christ, Whom Thou hast sent,”[John 17:3] so, too, to know the Holy Spirit is life. For the Lord said: “If ye love Me, keep My commandments, and I will ask the Father and He shall give you another Paraclete, that He may abide with you for ever, even the Spirit of Truth, Whom the world cannot receive, because it seeth Him not, neither knoweth Him, but ye know Him, for He is with you, and ...

Nicene and Post-Nicene Fathers, Series 2, Volume 10, page 286, footnote 6 (Image)

Ambrose: Select Works and Letters

Dogmatic Treatises, Ethical Works, and Sermons. (HTML)

Exposition of the Christian Faith. (HTML)

Book V. (HTML)
Prologue. (HTML)
CCEL Footnote 2532 (In-Text, Margin)

15. This is the word of the Lord, this is the precious talent, whereby thou art redeemed. This money must often be seen on the tables of souls, in order that by constant trading the sound of the good coins may be able to go forth into every land, by the means of which eternal life is purchased. “This is eternal life,” which Thou, Almighty Father, givest freely, that we may know “Thee the only true God, and Jesus Christ Whom Thou hast sent.”[John 17:3]

Nicene and Post-Nicene Fathers, Series 2, Volume 10, page 286, footnote 8 (Image)

Ambrose: Select Works and Letters

Dogmatic Treatises, Ethical Works, and Sermons. (HTML)

Exposition of the Christian Faith. (HTML)

Book V. (HTML)
Chapter I. How impious the Arians are, in attacking that on which human happiness depends. John ever unites the Son with the Father, especially where he says: “That they may know Thee, the only true God, etc.” In that place, then, we must understand the words “true God” also of the Son; for it cannot be denied that He is God, and it cannot be said He is a false god, and least of all that He is God by appellation only. This last point being proved from the Apostle's words, we rightly confess that Christ is true God. (HTML)
CCEL Footnote 2534 (In-Text, Margin)

18. Therefore as the Evangelist forthwith at the outset joined the Word with God the Father in his devout confession of faith, saying: “And the Word was with God;” and here too, in writing the words of the Lord: “That they may know Thee, the only true God, and Jesus Christ Whom Thou hast sent,”[John 17:3] he has undoubtedly, by thus connecting Them, bound together the Father and the Son, so that no one may separate Christ as true God from the majesty of the Father, for union does not dissever.

Nicene and Post-Nicene Fathers, Series 2, Volume 11, page 576, footnote 2 (Image)

Sulpitius Severus, Vincent of Lerins, John Cassian

The Works of John Cassian. (HTML)

The Seven Books of John Cassian on the Incarnation of the Lord, Against Nestorius. (HTML)

Book IV. (HTML)
Chapter V. How in virtue of the hypostatic union of the two natures in Christ the Word is rightly termed the Saviour, or incarnate man, and the Son of God. (HTML)
CCEL Footnote 2459 (In-Text, Margin)

... Jesus Christ the Son of God are one and the same Person. But do you want to be told more fully that,—though Christ according to the flesh was truly born as man of man,—yet in virtue of the ineffable unity of the mystery, by which man was joined to God, there is no separation between Christ and the Word? Hear the gospel of the Lord, or rather hear the Lord Himself saying of Himself: “This,” says He, “is life eternal, that they may know Thee, the only true God, and Jesus Christ whom Thou hast sent.”[John 17:3] You heard above that the Word of God was sent to heal mankind: here you are told that He who was sent is Jesus Christ. Separate this, if you can,—though you see that so great is the unity of Christ and the Word, that it was not merely that Christ ...

Nicene and Post-Nicene Fathers, Series 2, Volume 12, page 136, footnote 10 (Image)

Leo the Great, Gregory the Great

The Letters and Sermons of Leo the Great. (HTML)

Sermons. (HTML)

On the Feast of the Nativity, IV. (HTML)
CCEL Footnote 786 (In-Text, Margin)

... to please God784784    Ib. xi. 6.,” and without it nothing is holy, nothing is pure, nothing alive: “for the just lives by faith,” and he who by the devil’s deception loses it, is dead though living, because as righteousness is gained by faith, so too by a true faith is eternal life gained, as says our Lord and Saviour. And this is life eternal, that they may know Thee, the only true God, and Jesus Christ, whom Thou hast sent[John 17:3]. May He make you to advance and persevere to the end, Who lives and reigns with the Father and the Holy Spirit, for ever and ever. Amen.

Online Dictionary & Commentary of Early Church Beliefs