Central argument: You should be skeptical about learning or "You should be skeptical about learning".

Argument 1: Doubt is a necessary step to distinguish truth from falsehood.

About the author

Gu Jiegang (1893- 1980), formerly known as Yong Kun, has a strong word. People from Suzhou, Jiangsu. 1920 graduated from philosophy department of Peking University, a famous historian, folklorist, founder of ancient history school, pioneer and founder of modern historical geography and folklore. He is the author of "A Brief Academic History of Han Dynasty" and "A Preliminary Compilation of Scholars' Miscellaneous Knowledge".

Interpretation of terms

Firstly, with the help of Cheng Yi and Zhang Zai's famous sayings, this paper puts forward the view that academic research must be skeptical. Then explain the reason why this argument is put forward, and then explain in detail how to study and study with the spirit of doubt, and sum up the sub-argument that "doubt is a necessary step to distinguish truth from falsehood in negation"

In the last paragraph, another argument is put forward: "Doubt is also the basic condition for establishing new theories and inspiring new inventions from positive aspects".