The famous saying "cultivate one's morality, keep the family in order, govern the country and level the world" in history was not written for ordinary people, because it was impossible for ordinary people in that era to read it, and it did not rise to the civil service system of social management. It is written for officials (nobles) and even monarchs, inspiring life and achieving the pursuit of life. Self-cultivation means that you have enough talent and virtue. Keeping one's family well means managing one's manor, governing the country means assisting the monarch (or the monarch himself) to manage the country well, and leveling the world means achieving the world (the concept of the world at that time was the so-called "China" north of the Yangtze River basin). Times have changed, and tomorrow's feudal society has already turned into historical dust. However, in the history of China, I don't know how many great heroes were inspired and guided by this famous saying. "Cultivate one's morality, keep one's family in order, govern the country and level the world" comes from the book Book of Rites University. The book says, "We should know things in hindsight, be sincere in hindsight, be sincere in hindsight, cultivate one's mind in hindsight, cultivate one's morality in the future, and govern the country after the family, and the world will be at peace after the country is governed". The background of this old saying is a typical feudal society in China. At that time, the society was completely different from today's society, that is, Qin Shihuang unified China for more than two thousand years. The Zhou Dynasty sealed eight hundred vassals, each of which was a country. Every country has relatively independent administrative, financial, judicial and military powers, but it is definitely not a sovereign country in the modern sense. The vassal state was divided into several aristocratic families, each of which was a home, equivalent to a manor; Such a home is far from the home of ordinary people in modern society. At that time, families in today's society could only be called households, and ordinary citizens in today's society could only be called slaves or slave owners at that time.