Aesop, the ancient storyteller, told this fable: Once upon a time, a donkey found a lion's skin. He tried it on, strutted around, and frightened many animals. Soon a fox came along, and the donkey tried to scare him, too. But the fox, hearing the donkey's voice, said, "If you want to terrify me, you'll have to disguise your bray." Aesop's moral: Clothes may disguise a fool, but his words will give him away.