Matthew 5:28-30 NLT

"You have heard the commandment that says, 'You must not commit adultery.' But I say, anyone who even looks at a woman with lust has already committed adultery with her in his heart. So if your eye-even your good eye-causes you to lust, gouge it out and throw it away. It is better for you to lose one part of your body than for your whole body to be thrown into hell. And if your hand-even your stronger hand-causes you to sin, cut it off and throw it away. It is better for you to lose one part of your body than for your whole body to be thrown into hell.

If you stop listening to instruction, my child, you will turn your back on knowledge.