“To remember is far worse than to forget. This is not a discovery of mine. It was an old truth in the times of the Greek statesman Themistocles. Once he was approached—so the story goes—by a schoolmaster who asked him for a reward because he had thought out a system of teaching that greatly improved the memory of his pupils. Themistocles answered: “I shall give you a reward if you invent a method of enabling mankind to learn how to forget, not how to remember.”