2, from the eighth chapter of Laozi's Tao Te Ching. In addition, the classic Tao Te Ching was written before the separation of the pre-Qin philosophers in ancient China, and the legend was written by Laozi, which is an important source of Taoist philosophy.
3. The text of Tao Te Ching takes "virtue" in the philosophical sense as the main line, and discusses the ways of self-cultivation, governing the country, using troops and keeping in good health, but it mostly aims at politics. It is the so-called "inner sage and outer king" theory, which has profound meaning and wide tolerance and is known as the king of all classics.