Just so no one accuses me again of forbidding good works, let me say that one should with all seriousness be contrite and remorseful, confess and do good works. … After [the grace of God] we can do a lot of good [works]—to the glory of God alone and to the benefit of our fellow-men, and not in order that we might depend upon that as sufficient to pay for our sin. For God gives us his grace freely and without cost; so we should also serve him freely and without cost.

—Martin Luther
“Word and Sacrament I” in LW, 35:17.