What you know but can't do is only a little knowledge. Cheng Yi learned it on paper, and finally realized it. He told his son to learn poetry. This sentence tells people to pay attention to go deep into reality, experience life and collect materials. Action is the mother of thought-the practice of Tao Xingzhi, the queen of science. Bacon Su Dongpo told the story of a blind man asking the sun in Japanese (the content is omitted). Although the blind man in P354 story is very studious, he is limited by conditions. You can't personally understand the objective reality, but you can only forge others, and others' explanations of related problems do not take into account the actual situation of the blind, and often try to express them in the most vivid and simple way you think, so it is inevitable to make jokes. ...

The Indian fable "The Blind Touch the Elephant" tells the same thing. ...

Sima Qian wrote the immortal masterpiece Su Shi's Night Tour in Shi Zhongshan. In this paper, the author emphasizes the importance of watching, listening and on-the-spot investigation, and opposes subjective assumptions and hasty blind obedience. This is an attitude of scientific research. Li Shizhen's Visit to the Four Sides eventually became a masterpiece, which was studied in great detail. It took 19 years for Wang Qingren to write "Correcting Mistakes in Medical Forest". Yu Hao, a builder, spent his whole life practicing diligently and meticulously, and Zhu Kezhen accumulated more than 40 meteorological journals to observe the climate personally.