Even more from Martin Luther

Therefore a man becomes a Christian, not by working but by listening. And so anyone who wants to exert himself toward righteousness must first exert himself in listening to the Gospel. Now when he has heard and accepted this, let him joyfully give thanks to God, and then let him exert himself in good works that are commanded in the Law; thus the Law and works will follow hearing with faith. Then he will be able to walk safely in the light that is Christ; to be certain about choosing and doing works that are not hypocritical but truly good, pleasing to God, and commanded by, Him; and to reject all the mummery of self-chosen works. - Luther's Commentary on Galatians 3:2.