I love this story, and haven't the faintest idea where I learned it. Ah, well.
The nomads' dream
A group of nomads were discussing their dreams from the previous night, and discovered that they had all dreamed the same thing.
In the dream, a voice, like the voice of God, had said to each of them: "Gather up stones from the morning camp, gather pebbles and rocks from the morning camp, and carry these stones and pebbles and rocks all the day in your saddlebags. When you reach the evening camp, you will be both happy and sad."
They agreed that it was an important dream, although none of them understood it.
Some were puzzled, for gathering rocks seemed such a silly thing to do.
Some were angry, for surely a true dream should be significant, yet they could not see the significance of...rocks.
Some were resigned, for they had no understanding and did not hope to gain it.
Yet they all gathered some stones, some pebbles, some rocks, and put them in their saddlebags, and carried them all the day.
At the end of the day's travels, when the nomads unpacked their saddlebags to make camp for the night, they discovered that all of the stones, all of the pebbles, all of the rocks which they had gathered had turned into diamonds, into rubies, into sapphires.
They were happy indeed to have the valuable gems.
They were also sad that they had not gathered up more rocks.