Before you realize this truth, say the Yogis, you will always be in despair, a notion nicely expressed in this exasperated line from the Greek stoic philosopher Epictetus: 'You bear God within you, poor wretch, and know it not.

There are 10,000 books in my library, and it will keep growing until I die. This has exasperated my daughters, amused my friends and baffled my accountant. If I had not picked up this habit in the library long ago, I would have more money in the bank today; I would not be richer.