4:19Let us therefore love God: because God first hath loved us.
4:20If any man say: I love God, and hateth his brother; he is a liar. For he that loveth not his brother whom he seeth, how can he love God whom he seeth not?
4:21And this commandment we have from God, that he who loveth God love also his brother.
5:1Whosoever believeth that Jesus is the Christ, is born of God. And every one that loveth him who begot, loveth him also who is born of him. Is born of God... That is, is justified, and become a child of God by baptism: which is also to be understood; provided the belief of this fundamental article of the Christian faith be accompanied with all the other conditions, which, by the word of God, and his appointment, are also required to justification; such as a general belief of all that God has revealed and promised: hope, love, repentance, and a sincere disposition to keep God's holy law and commandments.
5:2In this we know that we love the children of God: when we love God and keep his commandments.
5:3For this is the charity of God: That we keep his commandments. And his commandments are not heavy.
5:4For whatsoever is born of God overcometh the world. And this is the victory which overcameth the world: Our faith. Our faith... Not a bare, speculative, or dead faith; but a faith that worketh by charity. Gal. 5.6
Commentary
DoctrinalGod’s prior love establishes a new birth that is proven by obedient charity toward the visible brother. Christ’s proclaimed fulfillment inaugurates liberation that simultaneously constitutes judgment in the present.”