“Therefore, just as it is impossible for Christ with his righteousness not to please God, so it is impossible for us, with our faith clinging to his righteousness, not to please him. It is in this way that a Christian becomes almighty lord of all, having all things and doing all things, wholly without sin. Even if he is in sins, these cannot do him harm; they are forgiven for the sake of the inexhaustible righteousness of Christ that removes all sins. It is on this that our faith relies, firmly trusting that he is such a Christ as we have described.”
Luther, Martin. “Fourteen Consolations for Those Who Labor and Are Heavy Laden” (1520) Luther’s Works Vol. 42. Philadelphia: Fortress Press, 1969, p. 165.