From "Suzanne’s Diary for Nicholas” by James Patterson:
Imagine life is a game in which you are juggling five balls. The balls are called work, family, health, friends, and integrity. And you’re keeping all of them in the air.But one day, you finally come to understand that work is a rubber ball. If you drop it, it will bounce back.The other four balls - family, health, friends, integrity - are made of glass. If you drop one of these, it will be irrevocably scuffed, nicked, perhaps even shattered.