The reason why the Old Classics are enduring is also based on its own philosophical principle of "all things are unified into one". Taoism advocates that Tai Chi is infinite, and Tai Chi is divided into two instruments, and then everything is male to female, heaven to earth, yin to yang, ... And if you want to survive, you must seek common ground while reserving differences, and Yin and Yang are mutually compatible and harmonious. As far as Taoism is concerned, there are heaven, tunnel, humanity and natural Tao.