Author "Zhuangzi"? pre-Qin period

Zhuangzi and Keiko play together on Hao's bridge. Zhuangzi said: "How leisurely the fish in the river are in the river. This is the happiness of the fish." . "Keiko said," you are not a fish, where do you know that fish is happy? " ? " Zhuangzi said, "You are not me. How do you know that I don't know that fish are happy?" ? "Keiko said," I am not a son, and I really don't know my son. "Zigu is not a fish, but I don't know the joy of fish!" Zhuangzi said, "Please follow its source. Confucius said:' Those who know fish are also', those who know me, ask me, and I know it. "