Greg Anderson, in Living Life on Purpose, tells a story about a man whose wife had left him. He was completely depressed. He had lost faith in himself, in other people, in God--he found no joy in living. One rainy morning this man went to a small neighborhood restaurant for breakfast. Although several people were at the diner, no one was speaking to anyone else. Our miserable friend hunched over the counter, stirring his coffee with a spoon.

In one of the small booths along the …