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 LutherWhen some say that good works are forbidden when we preach faith alone, it is as if I said to a sick man: "If you had health, you would have the use of all your limbs; but without health, the works of all your limbs are nothing"; and he wanted to infer that I had forbidden the works of all his limbs.
Martin Luther