John's point in 1 John 4, 'God is love,' is that those who really do know God come to love that way too. Doubtless we do not do it very well, but aren't Christians supposed to love the unlovable-even our enemies? Because the Gospel has transformed us, our love is to be self-originating, not elicited by the loveliness of the loved. For that is the way it is with God. He loves because love is one of His perfections, in perfect harmony with all His other perfections.
D.A. Carson