Chuangtse and Hueitse had strolled on to the bridge over the Hao, when the former observed, "See how the small fish are darting about! That is the happiness of the fish."

"You not being a fish yourself," said Hueitse, "how can you know the happiness of the fish?"

"And you not being I," retorted Chuangtse, "how can you know that I do not know?"

"If I, not being you, cannot know what you know," urged Hueitse, "it follows that you, not being a fish, cannot know the happiness of the fish."

"Let us go back to your original question," said Chuangtse. "You asked me how I knew the happiness of the fish. Your very question shows that you knew that I knew. I knew it (from my own feelings) on this bridge."