"Knowing is knowing, not knowing is not knowing, this is knowing."

"Knowing is knowing, not knowing is not knowing, it is knowing" means: knowing means knowing, not knowing means not knowing, only those who are smart, Confucius faced the ridicule of his two children.

Confucius did not show anger, but frankly admitted that he had no knowledge of dialectics. This was a pragmatic attitude, which also showed that Confucius was modest, prudent, and pragmatic in his scientific attitude.