One of my favorite sermon illustrations....

Back during the days before automobiles, two preachers met in a certain town. The first asked the second how he was doing. “Furious!” replied the second. “Someone has stolen my bicycle and I think it’s one of my church members! I don’t know what to do.” The first preacher said: “Here’s what I’d do. I’d preach on the Ten Commandments this Sunday and when I got to ‘Thou shalt not steal’ I’d really hammer it home.” The second preacher said, “I think I’ll take your advice.” The next Monday, the first preacher ran into the second one and saw that he was riding the bicycle. He said, “I see my advice worked.” The second replied, “Not really. When I got to ‘Thou shalt not commit adultery, I remembered where I left my bicycle.”