Hiding for a sage referred to concealing or omitting things that were not beneficial to a sage or a certain dynasty or figure in history books. Here are some examples of things that have been hidden or omitted in history: The tyranny of Qin Shihuang and the burning of books and burying of scholars. Because Qin Shihuang's rule caused great damage to the culture and society at that time, some sages had reservations or concealed his tyranny and cruel methods. War and violence during the Roman Empire. During the Roman Empire, the destruction and casualties caused by war and violence were very large, so the descriptions of war and violence in history books were often mild to avoid arousing people's disgust and dissatisfaction. 3. The political corruption and power trading in the Han Dynasty. In the Han Dynasty, due to the great harm of political corruption and power and money transactions, these issues were often concealed or omitted in the history books. 4. The An Lushan Rebellion and the separation of the military towns during the Tang Dynasty. The An Lushan Rebellion and the separation of the military towns were very famous political turmoil and military conflicts in the Tang Dynasty. However, due to the influence of the political environment and the pattern of interests at that time, these issues were often concealed or omitted in the history books. These examples show that the truth of some events may be concealed or omitted in the writing of history, which may lead to the deviation of people's understanding and understanding of history.