"When the water is clear, there will be no fish, and when people look at it, there will be no disciples" is a famous motto in ancient China, which is found in The Great Dai Li Ji Zi Zhang Wen Entering the Palace. It is a well-known truth that there is no fish when the water is clear. The reason is nothing more than that the water is too clear for fish to survive. "People who observe it have no disciples." Inspection is harsh. Acts, that is, the meaning of the same kind or partner, now refers to "friends." This implies that in the real society, if people are too smart and too critical, they will not tolerate others, and there will be no partners and friends. Because smart people often can't tolerate his mistakes or differences in personality.

As for "people are invincible when they are mean", it is a joke invented by modern people. You should not be too mean. If you are too mean, the universe will be invincible and there will be no opponents.