to quote someone else: generosity (Gordon Macdonald)

"Never forget what someone has done for you; never remember what you have done for others."

taken from Secrets of the Generous Life by Gordon Macdonald

I think this is a great principle to live by, the only problem is that it is not always easy. It can be difficult to forget "how many" times you have helped someone when they need it again. But if you want to live generously, you will.

Secrets of the Generous Life is a great devotional, you need to get a copy and go through it.