I John 4:20

If a man say, I love God, and hateth his brother - This, as well as many other parts of this epistle, seems levelled against the Jews, who pretended much love to God while they hated the Gentiles; and even some of them who were brought into the Christian Church brought this leaven with them. It required a miracle to redeem St. Peter's mind from the influence of this principle. See Acts 10. Whom he hath seen - We may have our love excited towards our brother, 1. By a consideration of his excellences or amiable qualities. 2. By a view of his miseries and distresses. The first will excite a love of complacency and delight; the second, a love of compassion and pity. Whom he hath not seen? - If he love not his brother, it is a proof that the love of God is not in him; and if he have not the love of God, he cannot love God, for God can be loved only through the influence of his own love. See on Jo1 4:19 (note). The man who hates his fellow does not love God. He who does not love God has not the love of God in him, and he who has not the love of God in him can neither love God nor man.

loveth not . . . brother whom he hath seen, how can he love God whom he hath not seen--It is easier for us, influenced as we are here by sense, to direct love towards one within the range of our senses than towards One unseen, appreciable only by faith. "Nature is prior to grace; and we by nature love things seen, before we love things unseen" [ESTIUS]. The eyes are our leaders in love. "Seeing is an incentive to love" [Å“CUMENIUS]. If we do not love the brethren, the visible representatives of God, how can we love God, the invisible One, whose children they are? The true ideal of man, lost in Adam, is realized in Christ, in whom God is revealed as He is, and man as he ought to be. Thus, by faith in Christ, we learn to love both the true God, and the true man, and so to love the brethren as bearing His image. hath seen--and continually sees.

And this commandment have we from him,.... Either "from God", as the Alexandrian copy and the Vulgate Latin version read; and that to love the brethren is a commandment of God, is clear from Jo1 3:23; or from Christ, for it is also a command of his, even his new commandment, which he has given, and his people have received from him: that he who loveth God, love his brother also; see Joh 13:34; which is an argument persuading to attend to the one as well as to the other; for the same command that requires the one, requires the other: and he that transgresses it in one case, is a transgressor of it, as well as in the other. Next: 1 John Chapter 5

In this chapter the apostle exhorts to try spirits (Jo1 4:1), gives a note to try by (Jo1 4:2, Jo1 4:3), shows who are of the world and who of God (Jo1 4:4-6), urges Christian love by divers considerations (Jo1 4:7-16), describes our love to God, and the effect of it (Jo1 4:17-21).

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