This is from Children of the Mind, (fourth book of the Ender saga) by Orson Scott Card:
Changing the world is good for those who want their names in books. But being happy, that is for those who write their names in the lives of others, and hold the hearts of others as the treasure most dear.
You go, "Uncle" Orson!
(I love Card's works. His work is as beautiful and poetic as Ray Bradbury's, while remaining plausible. His characterizations are masterful. If History were to do him justice, he would be as widely quoted as Shakespeare. No, really.)