"It's the supreme art of the devil that he can make the law out of the gospel. If I can hold on to the distinction between law and gospel, I can say to him any and every time that he should kiss my backside. . . . Once I debate about what I have done and left undone, I am finished. But if I reply on the basis of the gospel, 'The forgiveness of sins covers it all,' I have won."
-- Martin Luther
(HT: Isaiah543 via Christ is Deeper Still)