Chuang Tzŭ and Hui Tzŭ had strolled on to the bridge over the Hao, when the former observed, “See how the minnows are darting about! That is the pleasure of fishes.”
“You not being yourself a fish,” said Hui Tzŭ, “how can you possibly know in what the pleasure of fishes consists?”
“And you not being I,” retorted Chuang Tzŭ, “how can you know that I do not know?”
“That I, not being you, do not know what you know,” replied Hui Tzŭ, “is identical with my argument that you, not being a fish, cannot know in what the pleasure of fishes consists.”
“Let us go back to your original question,” said Chuang Tzŭ. “You ask me how I know in what consists the pleasure of fishes. Your very question shows that you knew I knew. I knew it from my own feelings on this bridge.