" Briefly, this doctrine is that man suffers because of his craving to possess and keep for ever things which are essentially impermanent. Chief among these things is his own person, for this is his means of isolating himself from the rest of life, his castle into which he can retreat and from which he can assert himself against external forces. He believes that this fortified and isolated position is the best means of obtaining happiness; it enables him to fight against change, to strive to keep pleasing things for himself, to shut out suffering and to shape circumstances as he wills. In short, it is his means of resisting life. The "

― Alan W. Watts , The Spirit of Zen