Zi Zisi, a native of Lu, is the grandson of Confucius and the son of Confucius. Born in Zhou in 37 years, he died in Zhou Weilie in 24 years at the age of 82. A famous thinker in the Spring and Autumn Period. The great-grandfather taught by Confucius passed on Confucius' thoughts and theories to Zisi, and Zisi's disciples passed them on to Mencius.

Later generations called Zisi and Mencius school of thought and Mencius, so Zisi inherited Zeng Shen, enlightened Mencius and played an important role in the inheritance of Confucius and Mencius. Mencius and Biography of Xun Qing in Historical Records call Mencius a student of Zisi, while the inscription in Mencius calls Mencius a student of Zisi.

The careful thinking of knowledgeable interrogation comes from the famous sentence about learning in Chapter 20 of The Doctrine of the Mean. It is said that the author is Zi Si, a descendant of Confucius.

Original: erudite, interrogative, thoughtful, discerning and faithful. Yes, Fu Neng of learning, Fu CuO also; There are questions, problems and measures; There are Fu Si, Fu De and Fu CuO who are thinking; There are Fu Bian, Fu Ming and Fu CuO; There are blessings, blessings, blessings. If a person can do it, he will do it; People can do it in ten ways and thousands of ways. Can do this, stupid is wise, soft is strong.

Meaning: extensive study, detailed questions about knowledge, careful thinking, clear distinction and practical practice. If you don't learn, you will. You can't stop if you don't study. You can't stop without asking for advice and understanding thoroughly; If you don't think about it, you can't stop without thinking about it.

If you don't distinguish, you can't stop without distinguishing; If you don't do it, you won't do it. If you don't do it, you can't stop. Others learn once, and I learn a hundred times; Others will learn it ten times and I will learn it a thousand times. If this method can be implemented, even stupid people will become smart and even vulnerable people will become strong.