"The Six Books of Confucius' Family Sayings": "Good medicine is bitter to the mouth and good for the disease; honest words are irritating to the ears and good for the conduct." Take medicine, and don’t be afraid of hardship when taking medicine. Although bitterness is unpopular, we cannot refuse it as long as it is good for our health; "loyal advice that is harsh to the ear is helpful for action" means that correct criticism, suggestions, and opinions are of positive significance to the cultivation of personal morality and the development of national undertakings. . Although some words may be harsh and some criticisms may be heart-burning, as long as they are honest and beneficial, one should not be picky about whether the commentator's words are pleasing to the ear or whether the method is appropriate. This wise article aims to educate people to be brave enough to accept criticism. It emphasizes that most good medicines have a bitter taste, but they are good for curing diseases; most of the words that teach people to be kind are not pleasant to the ears, but they are good for people to correct their shortcomings. What these two people say is very correct about the transition from treating diseases to treating the body, and from treating the body to governing the country. They express the theme clearly through the comparison of language before and after and the complementarity of philosophy. Everyone knows how to govern a body and a country, and it belongs to the category of sociology, so I dare not comment on it.