Not only the adoration of images is idolatry, but also trust in one's own righteousness, works and merits, and putting confidence in riches and power. As the latter is the commonest, so it also is the most noxious.
Martin LutherIt is as if a wolf devoured a sheep and the sheep were so powerful that it transformed the wolf and turned him into a sheep. So, when we eat Christ's flesh physically and spiritually, the food is so powerful that it transforms us.
Martin LutherIt is false that the will, left to itself, can do good as well as evil, for it is not free, but in bondage...On the side of man there is nothing that goes before grace, unless it be impotency and even rebellion.
Martin LutherYes, would to God that I could persuade the rich and the mighty that they would permit the whole Bible to be painted on houses, on the inside and the outside, so that all can see it. That would be a Christian work... If it is not a sin but good to have the image of Christ in my heart, why should it be a sin to have it in my eyes? This is especially true since the heart is more important than the eyes, and should be less stained by sin because it is the true abode and dwelling place of God.
Martin Luther