"Beloved, let us love one another, for love is from God, and whoever loves has been born of God and knows God. Anyone who does not love does not know God, because God is love. In this the love of God was made manifest among us, that God sent his only Son into the world, so that we might live through him. In this is love, not that we have loved God but that he loved us and sent his Son to be the propitiation for our sins. Beloved, if God so loved us, we also ought to love one another." 1 john 4:7-11 esv
"This is the very genius of biblical ethics. Become what your are. Do what God is at work in you to do. If we can grasp the way John thinks here, we will guard ourselves on the one hand against a legalism that boasts in its obedience, and on the other hand against a lawlessness that says Christians don't have to listen to the commands of Scripture. You can't boast in God's sanctifying work. And you can't ignore commands that God has ordained to produce that work."
john piper // love one another