Psalm 37

"Delight yourself in the Lord and He will give you the desires of your heart. Commit your way to the Lord; trust in Him and He will do this: He will make your righteousness shine like the dawn, the justice of your cause like the noonday sun."
Psalm 37: 4-6

A challenge, perhaps? Delight yourself in and commit to the Lord. It would seem that doing so would reap great rewards.