If you want to know whether or not someone truly loves God, watch what he or she does. If a person does not do the things that God says are pleasing and acceptable, and in fact does the things that God abhors and forbids, and yet claims to love God, it will be tough to support that claim. In fact, John argues, “The one who says, ‘I have come to know Him,’ and does not keep His commandments, is a liar and the truth is not in him; but whoever keeps His word, in him the love of God has truly been perfected” (1 John 2:4-5a).
– Voddie Baucham