Paraphrase from Ravi Zacharaias:
There was a little boy who had many marbles, and a girl who had candy. The little girl told him she would give him all of the candy if he gave her all of his marbles. The little boy went and took his finest marble and stuffed it under his pillow. He then went and gave her the rest of his marbles; the girl gave him her all of candy.
At night, the little girl was sound asleep, but the boy kept tossing and turning wondering, with one question in his head: I wonder if she gave me all of her candy.
If you have never totally committed your will to Him, you go to bed wondering every night if He has given His all to you.