Martin Luther on Faith

"We believe that the very beginning and end of salvation, and the sum of Christianity, consists of faith in Christ, who by His blood alone, and not by any works of ours, has put away sin, and destroyed the power of death."

"The heathen really make their self-invented notions and dreams of God and idol. Ultimately, they put their trust in that which is nothing. So it is with all idolatry. For it happens not merely by erecting an image and worshipping it, but rather it happens in the heart. For the heart seeks help and consolation from creatures, saints, or devils. It neither cares for God, nor looks to Him for anything better than to believe that He is willing to help."

"What does it mean to have a god? or, what is God? Answer: A god means that from which we are to expect all good and to which we are to take refuge in all distress, so that to have a God is nothing else than to trust and believe Him from the heart; as I have often said that the confidence and faith of the heart alone make both God and an idol. If your faith and trust be right, then is your god also true; and, on the other hand, if your trust be false and wrong, then you have not the true God; for these two belong together faith and God. That now, I say, upon which you set your heart and put your trust is properly your god."

"Adam was created righteous, acceptable, and without sin. He had no need from his labor in the garden to be made righteous and acceptable to God. Rather, the Lord gave Adam work in order to cultivate and protect the garden. This would have been the freest of all works because they were done simply to please God and not to obtain righteousness. … The works of the person who trusts God are to be understood in a similar manner. Through faith we are restored to paradise and created anew. We have no need of works in order to be righteous; however, in order to avoid idleness and so that the body might be cared for an disciplined, works are done freely to please God."

"One ought to fast, watch, and labor to the extent that such activities are needed to harness the body’s desires and longings; however, those who presume that they are justified by works pay no attention to the need for self-discipline but see the works themselves as the way to righteousness. They believe that if they do a great number of impressive works all will be well and righteousness will be the result. Sometimes this is pursued with such zeal that they become mentally unstable and their bodies are sapped of all strength. Such disastrous consequences demonstrate that the belief that we are justified and saved by works without faith is extremely foolish."