Once upon a time there lived a man who had, as a friend, a rich public servant. One day the man called on his rich friend, who entertained him with food and wine. He became completely inebriated and fell asleep. The rich friend, however, suddenly had to set out on a journey involving urgent public business. He wanted to give his friend a priceless jewel which had the mystic power to fulfill any desire. But his friend was fast asleep. Finding no other alternative, he sewed the gem into the hem of his sleeping friend's robe. The man awoke to find his friend gone, totally unaware of the jewel his friend had given him. Before long, he allowed himself to sink into poverty, wandering through many countries and experiencing many hardships. After a long time, now reduced to sheer want, he met his old friend. The rich man, surprised at his condition, told him about the gift he had given him, and the man learned for the first time that he had possessed the priceless jewel all along.
This is an allegory told by Shakyamuni Buddha's disciples as they reflect upon their ignorance in forgetting to develop the supreme life condition of Buddhahood and being satisfied with lower states of life.