Marbles and Candy

"A little boy had lots of pretty marbles.  But he was constantly eyeing his sister's bagful of candy.  One day he said to her, "If you give me all your candy, I'll give you all of my marbles."  She gave it much thought, and agreed to the trade.  He took all her candy and went back to his room to get his marbles.  But the more he admired them the more reluctant he became to give them all up.  So he hid the best of them under his pillow and took the rest to her.  That night, she slept soundly, while he tossed and turned restlessly, unable to sleep and thinking, "I wonder if she gave me all the candy?"

-I did not write this story. I happened to hear Ravi Zhacharias talk about it. He did not write it either.