Act of giving is more satisfying than act of receiving.Our every action is bound with some expectation of return or reward. We are also taught that we must act on things where we would gain and not lose. But, on closer observation it is found that any act of kind giving provides one with more satisfaction than achieving or receiving any reward.
The feeling of satisfaction that one gets when he/she helps other is much bigger than our own limited feeling of receiving. We feel good when we provide some hungry person with food or clothing or donate our books to needy childrens, etc. These act have huge impact rather than the act of gaining and achieving, no matter how much we have.
It is very wisely said that "When God provides you with money and prosperity, raise your standard of giving and not just your standard of living"