Matthew Henry's Concise Commentary on the Bible - 1 John 5:1-5
1-5 True love for the people of God, may be distinguished from natural kindness or party attachments, by its being united with the love of God, and obedience to his commands. The same Holy Spirit that taught the love, will have taught obedience also; and that man cannot truly love the children of God, who, by habit, commits sin or neglects known duty. As God's commands are holy, just, and good rules of liberty and happiness, so those who are born of God and love him, do not count them grievous,... read more
George Haydock's Catholic Bible Commentary - 1 John 5:2
In this we know that we love the children of God, (that is, all men, and especially the faithful, who are made his adoptive children) when we love God, and keep his commandments, for these two branches of charity, the love of God and of our neighbour, are inseparable: the one is known and proved by the other. (Witham) read more