1 John 4:11-12
11. God's love to us is the grand motive for our love to one another (1Jo 3:16).
if—as we all admit as a fact. we . . . also—as being born of God, and therefore resembling our Father who is love. In proportion as we appreciate God's love to us, we love Him and also the brethren, the children (by regeneration) of the same God, the representatives of the unseen God.12. God, whom no man hath seen at any time, hath appointed His children as the visible recipients of our outward kindness which flows from love to Himself, "whom not having seen, we love," compare Notes, 1Jo 4:11, 1Jo 4:19, 20. Thus 1Jo 4:12 explains why, instead (in 1Jo 4:11) of saying, "If God so loved us, we ought also to love God," he said, "We ought also to love one another."
If we love one another, God dwelleth in us—for God is love; and it must have been from Him dwelling in us that we drew the real love we bear to the brethren (1Jo 4:8, 16). John discusses this in 1Jo 4:13-16. his love—rather, "the love of Him," that is, "to Him" (1Jo 2:5), evinced by our love to His representatives, our brethren. is perfected in us—John discusses this in 1Jo 4:17-19. Compare 1Jo 2:5, "is perfected," that is, attains its proper maturity.1 John 4:20
20. 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" [ 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.1 John 5:2
2. By—Greek, "In." As our love to the brethren is the sign and test of our love to God, so (John here says) our love to God (tested by our "keeping his commandments") is, conversely, the ground and only true basis of love to our brother.
we know—John means here, not the outward criteria of genuine brotherly love, but the inward spiritual criteria of it, consciousness of love to God manifested in a hearty keeping of His commandments. When we have this inwardly and outwardly confirmed love to God, we can know assuredly that we truly love the children of God. "Love to one's brother is prior, according to the order of nature (see on 1Jo 4:20); love to God is so, according to the order of grace (1Jo 5:2). At one time the former is more immediately known, at another time the latter, according as the mind is more engaged in human relations or in what concerns the divine honor" [ESTIUS]. John shows what true love is, namely, that which is referred to God as its first object. As previously John urged the effect, so now he urges the cause. For he wishes mutual love to be so cultivated among us, as that God should always be placed first [CALVIN].