It is impossible for one man both to labor day and night to get a living, and at the same time give himself to the study of sacred learning as the preaching office requires.
Martin LutherAs long as a man is persuaded that he can make even the smallest contribution to his salvation, he remains self-confident and does not utterly despair of himself, and so is not humbled before God. Such a man plans out for himself a position, an occasion, a work, which shall bring him final salvation, but which will not.
Martin LutherGod does not give grace freely in the sense that He will demand no satisfaction, but He gave Christ to be the satisfaction for us.
Martin Luther