“It should not bore you if we repeat here what we teach, preach, sing, and write at other times and places. For if we lose the doctrine of justification, we lose simply everything.
Hence the most necessary and important thing is that we teach and repeat this doctrine daily, as Moses says about his Law (Deut. 6:7). For it cannot be grasped or held enough or too much. In fact, though we may urge and inculcate it vigorously, no one grasps it perfectly or believes it with all his heart.
So frail is our flesh and so disobedient to the Spirit!”
–Martin Luther, Luther’s Works, Vol. 26: Lectures on Galatians, 1535, Chapters 1-4 (ed. Jaroslav Jan Pelikan, Hilton C. Oswald, and Helmut T. Lehmann; vol. 26; Saint Louis: Concordia Publishing House, 1999), 26: 26.