Zen Story - Finding a diamond on a muddy road

The Zen story "Finding a Diamond on a Muddy Road" tells of a young monk who discovers a valuable diamond on a muddy path. He chooses to give it away to a wealthy merchant instead of selling it, saying it will bring the merchant more happiness than it would bring him. Years later, the monk becomes an abbot of a monastery, and the merchant who he had given the diamond to visits him, revealing that he had become wealthy beyond his wildest dreams since receiving the diamond. The merchant gives the monk a piece of jade as a gift, and the monk realizes that the true value of the diamond was in the happiness it brought to others, and the joy of giving was the true gift he received.