One is not righteous who does much, but the one who, without work, believes much in Christ. The law says, 'Do this,' and it is never done. Grace says, 'Believe in this,' and everything is already done.
Martin LutherThe Deceiver can magnify a little sin for the purpose of causing one to worry, torture, and kill oneself with it. This is why a Christian should learn not to let anyone easily create an evil conscience in him. Rather let him say, "This error and this failing pass away with my other imperfections and sins, which I must include in the article of faith: I believe in the forgiveness of sins.
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 Luther