Confucius said: "You, let me teach you what you know! Knowing it means knowing it, not knowing it means not knowing it, that is knowing."

You: Confucius' student, surnamed Zhong, given name You, courtesy name Zilu. The meaning of the whole sentence is: Zilu, tell me your attitude towards knowing and not knowing (that is, your attitude towards learning)! Knowing means knowing, and not knowing means not knowing. This is true wisdom.