 Jesus emphasized the need for pure thoughts as well as actions , and stated , " Everyone who looks at a woman <unk> has already committed adultery with her in his heart " ( Matthew 5 : 28 ) . The Catechism states that , with the help of God 's grace , men and women are required to overcome lust and bodily desires " for sinful relationships with another person 's spouse . " In <unk> of the Body , a series of lectures given by Pope John Paul II , Jesus ' statement in Matthew 5 : 28 is interpreted that one can commit adultery in the heart not only with another 's spouse , but also with his / her own spouse if one looks at him / her <unk> or treats him / her " only as an object to satisfy instinct " . 
