It is not otherwise to be known that we truly love the children of God, as such; for if we do, we must love them upon God's account, in conformity to him, and obedience to his commandments; wherefore our true love to them supposes our love to him, and is to be evinced by it.
Related Commentaries of 1 John 5:2
1 John 5:2
2 By this we know that we love the children of God, when we love God, and keep his commandments.