Luther says that God gave these two commandments to ensure his people knew that stealing is not only the physical act of taking unjustly from another, but is also the desiring of something that is not ours, such as our neighbor's wife, servant's or any property belonging to our neighbor. These commandments are not broken with the hand or the mouth but with the heart. They remind people who consider themselves virtuous that they too, by nature, sin. Toward the end of his explanation in the Large Catechism, Luther offers a powerful and critical theological insight: All the commandments constantly accuse us of sin and reveal to us where we stand under the Law in God's eyes–guilty! This is the chief purpose of the Law, to show us our sin.