23 And this is his commandment He again accommodates a general truth to his own purpose. The meaning is, that such is the discord between us and God, that we are kept off from an access to him, except we are united by love to one another. At the same time he does not here commend love alone, as before, but joins it as the companion and attendant of faith.

The Sophists by their glosses distort these words, as though liberty to pray were obtained by us, partly by faith and partly by works. As John requires us to keep God’s commandments that we may pray aright, and afterwards teaches us that this keeping refers to faith and love, they conclude, that from these two things ought we to derive confidence in prayer. But I have already several times reminded you, that the subject here is not how or by what means men may prepare themselves so that they may have confidence to pray to God, for he speaks not here of the cause of ills or of any worthiness. John only shews, that God favors none with the honor and privilege of intercourse with himself but his own children, even those who have been regenerated by his Spirit. The import, then, of what is said is, Where the fear and love of God do not prevail, it cannot be that God will hear prayer.

But if it be our purpose to obey his commandments, let us see what he commands. He does not, however, separate faith from love; but he requires both together from us. And this is the reason why he uses the word commandment in the singular number.

But this is a remarkable passage; for he defines briefly as well as lucidly in what the whole perfection of a holy life consists. There is then no reason that we should allege any difficulty, since God does by no means lead us about through long labyrinths, but simply and shortly sets before us what is right and what he approves. Besides, in this brevity there is no obscurity, for he shews to us clearly the beginning and the end of a life rightly formed. But that a mention is here only made of brotherly love, while the love of God is omitted, the reason is, as we have elsewhere said, that as brotherly love flows from the love of God, so it is a sure and real evidence of it.

On the name of his Son The name refers to preaching; and this connection deserves to be noticed, for few understand what it is to believe on Christ; but from this mode of speaking, we may easily conclude that the only right faith is that which embraces Christ as he is set forth in the Gospel. Hence also it is, that there is no faith without teaching, as Paul also shews to us in Romans 10:14. We must at the same time observe, that the Apostle includes faith in the knowledge of Christ; for he is the living image of the Father, and in him are laid up all the treasures of wisdom and knowledge. As soon, then, as we turn aside from him, we cannot do anything else but wander in error.

24 And he that keepeth his commandments He confirms what I have already stated, that the union we have with God is evident when we entertain mutual love: not that our union begins thereby, but that it cannot be fruitless or without effect whenever it begins to exist. And he proves this by adding a reason, because God does not abide in us, except his Spirit dwells in us. But wherever the Spirit is, he necessarily manifests his power and efficiency. We hence readily conclude, that none abide in God and are united to him, but those who keep his commandments.

When, therefore, he says, and by this we know, the copulative, and, as a reason is here given, is to be rendered, “for,” or, “because.” But the character of the present reason ought to be considered; for though the sentence in words agrees with that of Paul, when he says that the Spirit testifies to our hearts that we are the children of God, and that we through him cry to God, Abba, Father, yet there is some difference in the sense; for Paul speaks of the certainty of gratuitous adoption, which the Spirit of God seals on our hearts; but John here regards the effects which the Spirit produces while dwelling in us, as Paul himself does, when he says, that those are God’s children who are led by the Spirit of God; for there also he is speaking of the mortification of the flesh and newness of life.

The sum of what is said is, that it hence appears that we are God’s children, that is, when his Spirit rules and governs our life. John at the same time teaches us, that whatever good works are done by us, proceed from the grace of the Spirit, and that the Spirit is not obtained by our righteousness, but is freely given to us.