Joy and sorrow are, after all, only states of mind. He who gets his mind under control, keeping it unshakeably serene, will not let these usurpers gain entry. They do not come from the best part of himself. They come from the ego. How many persons could learn from him to give up their unhappiness if they learnt that most of their sorrows are mental states, the false ego pitying itself?
-- Perspectives > Chapter 24: The Peace within You > # 28