British theologian C.S. Lewis described happiness 50 years ago in terms that make even more sense today in our commuter-driven society:

A car is made to run on petrol [gasoline], and it would not run properly on anything else. Now God designed the human machine to run on himself. He himself is the fuel our spirits were designed to burn, or the food our spirits were designed to feed on. There is no other. That is why it is just no good asking God to make us happy in our own way without bothering about religion. God cannot give us a happiness and peace apart from himself, because it is not there. There is no such thing.