" Religion operates on the principle: I obey; therefore I am accepted (by God). The gospel operates on the principle: I am accepted through the costly grace of God; therefore I obey. Two people operating on these two principles can sit beside each other in church on Sunday trying to do many of the same things--read the Bible, obey the Ten Commandments, be active in church, and pray--but out of two entirely different motivations. Religion moves you to do what you do out of fear, insecurity, and self-righteousness, but the gospel moves you to do what you do more and more out of grateful joy in who God is in himself. Times "

― John Piper , The Supremacy of Christ in a Postmodern World