"It is rightly called the deceitfulness of sin because it deceives under the appearance of good. This phrase 'deceitfulness of sin' ought to be understood in a much wider sense, so that the term includes even one's own righteousness and wisdom. For more than anything else one's own righteousness and wisdom deceive one and work against faith in Christ, since we love the flesh and the sensations of the flesh and also riches and possessions, but we love nothing more ardently than our own feelings, judgment, purpose, and will, especially when they seem to be good."
Martin Luther, commenting on Hebrews 3:13
