Chapter 1
[1 John 1:1] -- What was from the beginning, etc. The blessed Apostle John wrote this Epistle about the perfection of faith and charity, praising the devotion of those who persevered in the unity of the Church; furthermore, he reproached the impiety of those who disturbed the peace of the Church with insane doctrines, especially Cerinthus and Marcion, who argued that Christ did not exist before Mary. He also wrote his Gospel on account of them, affirming in it both by his own words and the words of the Lord that the Son is consubstantial with the Father, while here he conveys in his own words what he learned from the Lord, refuting the foolishness of the heretics with apostolic authority. Hence, right at the beginning of the Epistle, he designates both the divinity and true humanity of the same God and our Lord Jesus Christ, saying: What was from the beginning, what we have heard. For the Son of God was indeed from the beginning, but the disciples heard and saw the same Son of God appearing in man with their eyes, which he elaborated more extensively in the Gospel. For what he says here: What was from the beginning, is what he states in the Gospel: In the beginning was the Word, and the Word was with God, and the Word was God. This was in the beginning with God (John I). And what he adds here: What we have heard, what we have seen with our eyes, is what he elaborates on there: And the Word became flesh, and dwelt among us, and we saw his glory, glory as of the only begotten from the Father (John I). And lest it seem too little to say in what he says: What we have seen with our eyes, he added:
[1 John 1:1] -- That which we have seen and our hands have touched concerning the Word of life. For not only did they see the Lord with their physical eyes like the others, but they also perceived His divine power with their spiritual eyes. Especially those who saw Him transfigured on the mount, among whom was John himself. And when he says, "and our hands have touched concerning the Word of life," he refutes the madness of the Manichaeans, who deny that the Lord assumed true flesh; the apostles could not doubt the truth of this flesh, as they attested not only by seeing but also by touching; especially John himself who, accustomed to recline on His bosom at supper, touched His limbs more freely the closer he was. And even after His resurrection from the dead, their hands touched concerning the Word of life, as they understood without any doubt that He had taken on true flesh, though now incorruptible, hearing Him say: "Touch and see, because a spirit does not have flesh and bones, as you see that I have" (Luke 24). It is well said, "and our hands have touched concerning the Word of life," because as they proved the truth of His resurrected flesh by touching with their hands, they more surely knew Him to be the Word of life, that is, the true God. Hence Thomas, who was specially ordered to touch Him, immediately upon touching the flesh, confessed Him to be God, saying, "My Lord and my God" (John 20).
[1 John 1:2] -- And the life was manifested, etc. He refers to that life which speaks in the Gospel: "I am the resurrection and the life" (John 11); which was manifested through divine miracles declared in the flesh, and the disciples present saw what they would testify to posterity with undoubted truth, when performing signs, as John himself wrote, He manifested His glory, and His disciples believed in Him (John 2). And because the apostle John testifies that he saw the life manifested with his co-apostles, the heretic Apelles should be confounded with his followers, who contends that the same life, that is, the Lord Savior, appeared to the world not as God in truth, but as a man in fantasy.
[1 John 1:2] -- And we proclaim to you eternal life, etc. It was with the Father in eternal divinity, and appeared in time to the world in humanity.
[1 John 1:3] -- What we have seen and heard, we proclaim to you, etc. Blessed John clearly shows that anyone who desires to have fellowship with God must first be united with the fellowship of the Church, learn that faith, and be imbued with its sacraments, which the disciples received from the Truth dwelling in the flesh itself. Nor in any way are those less associated with God who believe through the doctrine of the apostles, than those who believed through the Lord preaching in the world himself, except insofar as the quality of faith or works distinguishes them. Hence also concerning this fellowship of the saints, which they have in the Father and the Son, the Son himself, praying to the Father, says: Holy Father, keep them in your name, which you have given to me, that they may be one as we are one (John XVII). And a little later: I do not ask for these only, but also for those who will believe in me through their word, that they may all be one, just as you, Father, are in me, and I in you, that they also may be in us (John XVII).
[1 John 1:4] -- And we write these things to you so that your joy may be complete. The joy of teachers is made complete when, through preaching, they lead many to the fellowship of the holy Church, and to the fellowship of God the Father and his Son Jesus Christ, through whom the Church is strengthened and grows. Hence also Paul says to those whom he instructed in the faith: Complete my joy by being of the same mind, having the same love, being in full accord and of one mind (Philippians II).
[1 John 1:5] -- And this is the message which we have heard from him, etc. By this statement, blessed John both shows the excellence of divine purity, which we are also commanded to imitate, saying: Be holy, for I, the Lord your God, am holy (Leviticus XIX); and he refutes the insane doctrine of the Manicheans, who said that the nature of God was conquered and corrupted by the prince of darkness in war.
[1 John 1:6] -- If we say that we have fellowship with Him, etc. He names darkness, sins, heresies, and hatreds. Therefore, the mere confession of faith alone is not sufficient for salvation, to which the testimony of good works is lacking. But neither does the rectitude of works without the simplicity of faith and love profit. For whoever is besieged by darkness in any part cannot have fellowship with Him in whom no iniquities occur. For what fellowship has light with darkness? (II Cor. VI).
[1 John 1:7] -- But if we walk in the light, etc. The distinction of words is to be noted, because he says that God is in the light, but that we ought to walk in the light. For the righteous walk in the light, as they advance to better things by serving with works of virtue. But divine holiness, to which it is said: "But you are the same" (Ps. CI), is rightly remembered to be in the light, because being full goodness always existing, it does not find where it may advance. To the faithful it is said: "Walk as children of light" (Eph. V). For the fruit of light is in all goodness and righteousness and truth. But God always exists as good, just, and true without any progress. If, therefore, we walk in the light, as He is in the light, we have fellowship with one another. Because it evidently gives an indication that we are advancing by walking in the path of light, if we rejoice in the bond of fraternal fellowship, with which we likewise may reach the true light. But even if we are found to do the works of light, if we seem to hold inviolable the rights of mutual love, we should not think that by our progress or industry we are able to be completely cleansed from sins. For it follows:
[1 John 1:7] -- And the blood of Jesus Christ, His Son, cleanses us from all sin. For indeed, the sacrament of the Lord's passion both alleviated all past sins for us in baptism and forgives whatever we commit after baptism due to daily frailty, by the grace of the same our Redeemer. Especially when among the works of light that we perform, we humbly confess our errors to Him daily, when we receive the sacraments of His blood, when we pray for our debts to be forgiven as we forgive our debtors, when, mindful of His passion, we willingly endure each adverse thing. Remarkably, when speaking of the Lord, it is said: "And the blood of Jesus His Son"; indeed, the Son of God in the nature of divinity could not have blood; but since the same Son of God also became the Son of man, appropriately He calls the blood of the Son of God due to the unity of His person, to show that He truly assumed a body, truly shed His blood for us; and to refute the heretics who either deny that the true flesh was assumed by the Son of God or that the Lord Jesus truly suffered in the flesh which He assumed. Similar to this is what Paul says: "The Holy Spirit has made you overseers to shepherd the church of God which He purchased with His own blood" (Acts 20).
[1 John 1:8] -- If we say that we have no sin, etc. This sentence avails against the heresy of Pelagius, which claimed that all infants are born without sin and that the elect in this life can progress to such an extent as to be without sin. For even when the prophet says: "Behold, I was conceived in iniquity, and in sin my mother bore me" (Psalm 50), we cannot be without guilt in the world, having come into the world with guilt. But the blood of Jesus Christ, the Son of God, cleanses us from all sin so that our debts do not hold us under the power of our enemy, because the Mediator between God and man, the man Christ Jesus, freely repaid on our behalf what He did not owe. For He who undeservedly paid the debt of death in the flesh for us, freed us from the debt of the death of the soul.
[1 John 1:9] -- If we confess our sins, He is faithful, etc. Because we cannot be without sin in this life, the first hope of salvation is confession, and no one should consider themselves just or lift up their neck before the eyes of God. Then comes love, because charity covers a multitude of sins (1 Peter 4), which is consequently highly recommended to us with much praise in the following parts of this Epistle. Beautifully, both are suggested together, that we should both pray for our sins and obtain God's indulgence when we pray. Therefore, He is also called faithful to forgive sins, retaining the faithfulness of His promise, because He who taught us to pray for our sins and debts promised fatherly mercy and ensuing forgiveness. He also affirms Him to be just, because He justly forgives true confession. "That He may forgive us our sins," he says, "and cleanse us from all iniquity." He forgives daily and slight sins to the elect in this life, without which they cannot live on earth; He cleanses them after the dissolution of the flesh from all iniquity, bringing them into that life in which they neither wish to sin nor can. He now forgives greater temptations to those who pray, so they may not be overcome; He forgives the smallest, so they may not be injured; He then cleanses from all, so that no iniquity at all may exist among the blessed in the eternal kingdom.
[1 John 1:10] -- If we say that we have not sinned, etc. For he himself said through a man filled with his Spirit: There is no just man on earth who does good and does not sin (Ecclesiastes 7). But even through himself, he taught us that we cannot be free from sins, as he commanded us to pray thus: Forgive us our debts as we forgive our debtors (Matthew 6). Therefore, no one, being taught by Pelagius, should believe that he can live free from sins and debts, when he sees the apostles, being taught by the Lord, praying for their own sins. And elsewhere it is written: The just man falls seven times a day and rises again (Proverbs 24). For it is impossible for any of the saints not to sometimes fall into slight sins, which are committed through speech, thought, ignorance, forgetfulness, necessity, will, or surprise, and yet they do not cease to be just, because with the Lord's help, they quickly rise from guilt.