How Full Is Your Bucket? for Kids by Tom Rath 

Felix discovers that everyone has an invisible bucket, including him! Felix soon learns that by being kind and helpful, he can help fill not only his bucket, but others as well! This charming book explains to children how being kind not only helps others, it helps them, too. Using the metaphor of a bucket and dipper, Felix' grandfather explains why the happy people make Felix feel good, while the others leave him feeling bad -- and how Felix himself is affecting others, whether he means to or not. This beautifully illustrated book's powerful message -- that the way we relate to others has a profound effect on every aspect of our lives.