One day Chuang Tzu and a friend were walking by a river.
â€œLook at the fish swimming about,â€ said Chuang Tzu, â€œThey are really enjoying themselves.â€
â€œYou are not a fish,â€ replied the friend, â€œSo you canâ€™t truly know that they are enjoying themselves.â€
â€œYou are not me,â€ said Chuang Tzu. â€œSo how do you know that I do not know that the fish are enjoying themselves?â€
(almost stolen from renegade Zen)