Reason must be deluded, blinded, and destroyed. Faith must trample underfoot all reason, sense, and understanding, and whatever it sees must be put out of sight and ... know nothing but the word of God.
Martin LutherWhen one is possessed with doubt, that though he call upon the Lord he cannot be heard, and that God has turned him heart from him, and is angry ... he must arm himself with God's Word, promising to hear him.
Martin LutherBeing by his faith replaced afresh in paradise and created anew, he (the believer)does not need works for his justification, but that he may not be idle, but that he may exercise his own body and preserve it. His works are to be done freely, with the sole object of pleasing God.
Martin LutherA man would have to be an idiot to write a book of laws for an apple tree telling it to bear apples and not thorns, seeing that the apple-tree will do it naturally and far better than any laws or teaching can prescribe.
Martin Luther