A teaching of Jesus' during The Sermon on the Mount.
Jesus recounts the commandment Thou Shalt not Commit Adultery, but adds that if you look at another person with lust in your heart, you are committing adultery.
He says that it is better to remove the eye that is looking at the other person than for your entire body to go to hell.
I suppose that I am disappointed in that last paragraph. Why is Jesus teaching about retribution, when I think that perhaps teaching the guilty party to move on would be better? Why should you jump to remove something rather than healing it?
Having never been in a situation where I am committing adultery, I'm not the best person to prescribe any kind of "cure." I do wish that Jesus (or the Gospels) had provided more direction here.