"The power of changing oneself lies not in the mind, but in the body and the feelings. Unfortunately, however, our body and our feelings are so constituted that they don’t care a jot about anything so long as they are happy. They live for the moment and their memory is short. The mind alone lives for tomorrow. Each has its own merits. The merit of the mind is that it looks ahead. But it is only the other two that can "do.""