The Jews felt that adultery is a kind of theft. Though this is not entirely wrong, Jesus emphasizes its impurity in these two verses. He says that ruin awaits even the unchaste in thought. Nowhere is the inward aim of Christ's teaching so evident as in this comment. A change must first take place in the thoughts if conduct is going to be changed. The real problem with sin resides inside the mind. Christ traces impurity back beyond the lustful act, beyond the first touch of the hands, beyond the gaze of the eyes, to the inception of desire.