1 Thessalonians 4:9

But as touching brotherly love ye need not that I write unto you: the apostle proceeds from chastity and justice to speak of brotherly love, which is love upon a spiritual ground; to love the saints as such, with respect to God as a common Father, and so all his children are brethren, 1 Thessalonians 2:8,9; so Hebrews 13:1. And he persuadeth the practice of it by a loving and winning insinuation; Sure you are forward enough of yourselves; as he useth the same artifice, Acts 26:27,28 2 Corinthians 9:1; wherein the apostle tacitly commends them, and hereby would engage them to answer the commendation, and good opinion he had of them. For ye yourselves are taught of God to love one another; what need I write to teach you that which you have already been taught of God? The saints have this promise, Isaiah 54:13 Jeremiah 31:34; fulfilled, 1 John 2:26,27: and this Divine teaching is always efficacious, for none teacheth like God. Not that all teaching of men is to be laid aside, as some enthusiasts would hence infer, but that the apostle thought he had less need to teach that which God himself had so effectually taught them. Hereby we perceive that God's teaching doth not only enlighten the mind, but reacheth the affections, and especially inclines the heart to love, for God is love; and though they were taught other things of God besides this love, yet he mentions only this as the most proper work of the Spirit of God by the gospel; and though common love of man to man may be found in mere nature.