"See how the minnows come out and dart around where they please! That is what fish really enjoy!"

Hui Tzu said, "Your are not a fish- how do you know what fish enjoy?"

Chuang Tzu said, "You are not I, so how do you know I do not know hat fish enjoy?"

Hui Tzu said, "I am not you, so I certainly do not know what you know. On the other hand, you are certainly not a fish- so that still proves you don not know what fish enjoy!"

Chuang Tzu said, "Let's go back to your original question, please. You asked me how I know what fish enjoy- so you already knew I knew it when you asked the question. I know it by standing here beside the Hao."

Reference: Watson, B. (1964, translated). Chuang Tzu: Basic Writings, New York: Columbis University Press.