He noticed a woman of unusual beauty - 2 Samuel 11:2
Our enemy knows our weakness and it often comes to us through what we see
David fell because he allowed himself to stare lustfully and sinful thought quickly turned into a sinful action
He apparently learned from his blunder, he later wrote: "I will refuse to look at anything vile and vulgar - Psalms 101:3
Have you learned to safeguard your heart by safeguarding your eyes?
Can a man walk on hot coals and not blister his feet? - Proverbs 6:28