A man goes to a church one Sunday and hears a sermon about the Ten Commandments.  He has an epiphany and goes to confession.

Forgive me, Father, for I have sinned, "he begins.

"Go ahead, son" the priest says.

"Well, I lost my hat and I came to church to steal one.  But then I heard your sermon and I changed my mind."

"That's great," the priest replies, "Thou shalt not steal, is a powerful commandment."

"True," the man says. "But it was when you said, 'Thou shalt not commit adultery' that I remembered where my hat was."