There is a fairy story about a wealthy merchant, loaded with riches, who was in despair. He wondered why. He asked his companions how he could find happiness. "Look for a happy man," they told him, "and ask him to give you his shirt." The merchant searched for a long time until at last he found a happy man. "Give me your shirt," he said. "I can pay for it." The happy man began to laugh uproariously; he hadn't got a shirt! Then the merchant understood the cause of his own despair: man cannot live by bread alone.