The classic among the classics has to be said to be the Tao Te Ching. The text takes "virtue" in the philosophical sense as the key link, and discusses the ways of self-cultivation, governing the country, using troops and keeping in good health, but most of them aim at politics. The so-called "inner sage and outer king", known as the king of all classics, has profound meaning and is inclusive. Tao Te Ching mainly discusses that "Tao" and "life" and "virtue" are not the usual morality or virtue, but a monk should have a special world outlook, methodology and method of dealing with people. Tao is truth, law and theory, and its name is name, language and symbol system. What kind of cognitive ability and language ability, we can know and express what kind of Tao. Reading Laozi means reading the realm of harmony between man and nature, in which Taoism and morality are integrated.