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1 John 5:20

And we know that the Son of God is come: and he hath given us understanding that we may know the true God, and may be in his true Son. This is the true God and life eternal.

Challoner: And may be in his true SonHe is, or this is the true God, and life eternal. Which words are a clear proof of Christ's divinity, and as such made use of by the ancient fathers.
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The verse in its languages

Vulgate (Clementine)
Et scimus quoniam Filius Dei venit, et dedit nobis sensum ut cognoscamus verum Deum, et simus in vero Filio ejus. Hic est verus Deus, et vita æterna.
Greek New Testament (SBLGNT)
οἴδαμεν δὲ ὅτι ὁ υἱὸς τοῦ θεοῦ ἥκει, καὶ δέδωκεν ἡμῖν διάνοιαν ἵνα γινώσκωμεν τὸν ἀληθινόν· καὶ ἐσμὲν ἐν τῷ ἀληθινῷ, ἐν τῷ υἱῷ αὐτοῦ Ἰησοῦ Χριστῷ. οὗτός ἐστιν ὁ ἀληθινὸς θεὸς καὶ ζωὴ αἰώνιος.

Haydock's commentary

And may be in his true Son.7 This is the true God, and eternal life. Which words are a clear proof of Christ's divinity, and as such made use of by the ancient Fathers.

7 In vero Filio ejus, hic est verus Deus, en to alethino uio autou, outos estin o alethinos Theos, with the Greek article. St. Athanasius, St. Ambrose, St. Hilary, St. Augustine, St. Cyril by this sentence prove Christ truly God. See Petavius, lib. 2. de Trin. chap. ix. num. 8.

From Haydock's Catholic Bible Commentary, 1859, in the transcription made by Todd Easton and kept online by John Paul Wohlschied at johnblood.gitlab.io/haydock.

The Fathers on this verse

Clement of Alexandria The Stromata, or Miscellanies, Fragments of Clemens Alexandrinus

Ver. 20 . “And the Son of God hath come and given us understanding,” which comes to us, that is, by faith, and is also called the Holy Spirit. The second Epistle of John, which is written to Virgins, is very simple. It was written to a Babylonian lady, by name Electa, and indicates the election of the holy Church. He establishes in this Epistle that the following out of the faith is not without charity, and so that no one divide Jesus Christ; but only to believe that Jesus Christ has come in the flesh. For he who has the Son by apprehension in his intellect knows also the Father, and grasps with his mind intelligibly the greatness of His power working without beginning of time.

St Augustine On the Holy Trinity, That the Son is Very God, of the Same Substance with the Father. Not Only the Father, But the Trinity, is Affirmed to Be Immortal. All Things are Not from the Father Alone, But Also from the Son. That the Holy Spirit is Very God, Equal with the Father and the Son

9. They who have said that our Lord Jesus Christ is not God, or not very God, or not with the Father the One and only God, or not truly immortal because changeable, are proved wrong by the most plain and unanimous voice of divine testimonies; as, for instance, “In the beginning was the Word, and the Word was with God, and the Word was God.” For it is plain that we are to take the Word of God to be the only Son of God, of whom it is afterwards said, “And the Word was made flesh, and dwelt among us,” on account of that birth of His incarnation, which was wrought in time of the Virgin. …

St Augustine On the Holy Trinity, By What Rule in the Scriptures It is Understood that the Son is Now Equal and Now Less

22. Wherefore, having mastered this rule for interpreting the Scriptures concerning the Son of God, that we are to distinguish in them what relates to the form of God, in which He is equal to the Father, and what to the form of a servant which He took, in which He is less than the Father; we shall not be disquieted by apparently contrary and mutually repugnant sayings of the sacred books. For both the Son and the Holy Spirit, according to the form of God, are equal to the Father, because neither of them is a creature, as we have already shown: but according to the form of a servant He is less than the Father, because He Himself has said, “My Father is greater than I;” and He is less than Himself, because it is said of Him, He emptied Himself;” and He is less than the Holy Spirit, because He Himself says, “Whosoever speaketh a word against the Son of man, it shall be forgiven him; but who …

St Augustine On the Holy Trinity, In What Manner the Son is Said Not to Know the Day and the Hour Which the Father Knows. Some Things Said of Christ According to the Form of God, Other Things According to the Form of a Servant. In What Way It is of Christ to Give the Kingdom, in What Not of Christ. Christ Will Both Judge and Not Judge

26. For I ask again, in what manner this is said, “If any man hear not my words, I will not judge him?” For perhaps He has said here, “I will not judge him,” in the same sense as there, “It is not mine to give.” But what follows here? “I came not,” He says, “to judge the world, but to save the world;” and then He adds, “He that rejecteth me, and receiveth not my words, hath one that judgeth him.” Now here we should understand the Father, unless He had added, “The word that I have spoken, the same shall judge him in the last day.” Well, then, will neither the Son judge, because He says, “I will not judge him,” nor the Father, but the word which the Son hath spoken? Nay, but hear what yet follows: “For I,” He says, “have not spoken of myself; but the Father which sent me, He gave me a commandment, what I should say, and what I should speak; and I know that His commandment is life everlasti …

St Augustine Reply to Faustus the Manichæan, Faustus claims that the Manichæans and not the Catholics are consistent believers in the Gospel, and seeks to establish this claim by comparing Manichæan and Catholic obedience to the precepts of the Gospel. Augustin exposes the hypocrisy of the Manichæans and praises the asceticism of Catholics

4. Augustin replied: I have already said that the Lord Jesus Christ repeatedly calls Himself the Son of man, and that the Manichæans have contrived a silly story about some fabulous First Man, who figures in their impious heresy, not earthly, but combined with spurious elements, in opposition to the apostle, who says, "The first man is of the earth, earthy;" and that the apostle carefully warns us, "If any one preaches to you differently from what we have preached, let him be accursed." So that we must believe Christ to be the Son of man according to apostolic truth, not according to Manichæan error. …

St Augustine A Treatise on the Grace of Christ, and on Original Sin, He Shows by the Example of Abraham that the Ancient Saints Believed in the Incarnation of Christ

For it must not be supposed that those saints of old only profited by Christ’s divinity, which was ever existent, and not also by the revelation of His humanity, which had not yet come to pass. What the Lord Jesus says, “Abraham desired to see my day, and he saw it, and was glad,” meaning by the phrase his day to understand his time , affords of course a clear testimony that Abraham was fully imbued with belief in His incarnation. It is in respect of this that He has a “time;” for His divinity exceeds all time, for it was by it that all times were created. …

St Augustine Sermons on Selected Lessons of the New Testament, On the words of the Gospel, John xii. 44, ‘He that believeth on me, believeth not on me, but on him that sent me.’ Against a certain expression of Maximinus, a bishop of the Arians, who spread his blasphemy in Africa where he was with the Count Segisvult

3. “He Who sent Me,” saith He, ye have heard it; “He Who sent Me,” saith He, “He gave Me a commandment what I should say, and what I should speak; and I know that His commandment is life everlasting.” It is John’s Gospel, hold it fast. “He Who sent Me, He gave Me a commandment what I should say, and what I should speak; and I know that His commandment is life everlasting.” O that He would grant me to say what I wish! For my poverty and His abundance straiteneth me. “He,” saith He, “gave Me a commandment, what I should say, and what I should speak; and I know that His commandment is life everlast ing.” Search in the Epistle of this John the Evangelist for what he hath said of Christ. “Let us believe,” he says, “His True Son Jesus Christ. …

St Augustine Sermons on Selected Lessons of the New Testament, On the words of the Gospel, John xii. 44, ‘He that believeth on me, believeth not on me, but on him that sent me.’ Against a certain expression of Maximinus, a bishop of the Arians, who spread his blasphemy in Africa where he was with the Count Segisvult

6. Because then I was speaking of what I had brought forward, “And I knew,” saith He, “that His commandment is everlasting life.” Mark, Brethren, what I am saying; “I know that His commandment is everlasting life.” And we read in the same John concerning Christ, “He is The True God and Everlasting Life.” If the Father’s commandment is “everlasting Life,” and Christ the Son Himself is “everlasting Life;” the Son is Himself the Father’s Commandment. For how is not That the Father’s Commandment, which is the Father’s Word? Or if you take the commandment given to the Son by the Father in a carnal sense, as if the Father said to the Son, “I command Thee this, I wish Thee to do that;” in what words spake He to the Only Word? When He gave commandment to the Word, did He look for words? That the Father’s Commandment then is “Life everlasting,” and that the Son Himself is “Life everlasting,” beli …

St Augustine Ten Homilies on the First Epistle of John, 1 John V. 20; Contra Maximinum. lib. ii. c. 14, § 2, 3

1 Joann. v. 20 . “Ut simus in vero Filio ejus Jesu Christo; ipse est verus Deus et vita æterna .”

Theodoret The Ecclesiastical History of Theodoret, Confutation of Arianism deduced from the Writings of Eustathius and Athanasius

“The bishops convened in council being desirous of refuting the impious assertions invented by the Arians, that the Son was created out of that which was non-existent, that He is a creature and created being, that there was a period in which He was not, and that He is mutable by nature, and being all agreed in propounding the following declarations, which are in accordance with the holy Scriptures; namely, that the Son is by nature only-begotten of God, Word, Power, and sole Wisdom of the Father; that He is, as John said, ‘the true God,’ and, as Paul has written, ‘the brightness of the glory, and the express image of the person of the Father,’ the followers of Eusebius, drawn aside by their own vile doctrine, then began to say one to another, Let us agree, for we are also of God; ‘ There is but one God, by whom are all things ; ‘ Old things are passed away; behold, all things are become …

St Athanasius Statement of Faith. (Expositio Fidei.), Expositio Fidei. (Statement of Faith.)

1. We believe in one Unbegotten God, Father Almighty, maker of all things both visible and invisible, that hath His being from Himself. And in one Only-begotten Word, Wisdom, Son, begotten of the Father without beginning and eternally; word not pronounced nor mental, nor an effluence of the Perfect, nor a dividing of the impassible Essence, nor an issue; but absolutely perfect Son, living and powerful ( Heb. iv. 12 ), the true Image of the Father, equal in honour and glory. For this, he says, ‘is the will of the Father, that as they honour the Father, so they may honour the Son also’ ( Joh. v. 23 ): very God of very God, as John says in his general Epistles, ‘And we are in Him that is true, even in His Son Jesus Christ: this is the true God and everlasting life’ ( 1 Joh. v. 20 ): Almighty of Almighty. …

St Athanasius Circular to Bishops of Egypt and Libya. (Ad Episcopos Ægypti Et Libyæ Epistola Encyclica.), Chapter II

For maintaining these and the like opinions Arius was declared a heretic; for myself, while I have merely been writing them down, I have been cleansing myself by thinking of the contrary doctrines, and by holding fast the sense of the true faith. For the Bishops who all assembled from all parts at the Council of Nicæa, began to hold their ears at these statements, and all with one voice condemned this heresy on account of them, and anathematized it, declaring it to be alien and estranged from the faith of the Church. It was no compulsion which led the judges to this decision, but they all deliberately vindicated the truth: and they did so justly and rightly. …

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The Catechism cites this verse