“You have heard that it was said, ‘You shall not commit adultery.  But I tell you that anyone who looks at a woman lustfully has already committed adultery with her in his heart.”…  First of all, I want to emphasize that lust means a sexual thought because of course you know that sexuality is sinful and human beings aren’t supposed to think about sexual things.  And of course you also know that you should and can achieve absolute control over what thoughts run through your mind.  You haven’t mastered that yet?  Get to work!   And whatever you do, don’t let yourself be misled into thinking that lust might mean the desire to possess or overpower another person.   What we are really aiming for here is the suppression of your sexuality, not the subversion of power.