A young man was walking down a gravel road when a voice said to him "Pick up as many pebbles as you want and put them in your pocket, and tomorrow you will be both sorry and glad." The young man obeyed. He stooped down and picked up a handful of pebbles and put them into his pocket.
The next day he reached into his pocket and discovered that the pebbles had turned into diamonds, rubies and emeralds. And he was both glad and sorry. Glad that he had taken some - Sorry that he hadn't taken more.