In a university commencement address several years ago, Brian Dyson, CEO of Coca Cola Enterprises, spoke of the relation of work to one's other commitments:

Imagine life as a game in which you are juggling some five balls in the air. You name them work, family, health, friends and spirit and you're keeping all of these in the air. You will soon understand that work is a rubber ball. If you drop it, it will bounce back.

But the other four balls family, health, friends and spirit…