that is, truth and vulgarity. Also known as the first righteousness, secular truths, or the righteousness of scenic spots and famous sayings. Two truths of truth and vulgarity, the basic idea of the middle school is the theory of origin emptiness, which holds that everything in the world is formed by many factors. Being is called being false, which is the secular truth. There is no independent and unchanging self, but being empty and being empty, which is the true meaning, so the two truths of truth and vulgarity are being empty and having two truths. This is in terms of external physical environment. In terms of subjective understanding, it is said that secular truths exist, which is the common sense of ordinary people in the world; It is a unique transcendental view of the sage of the second multiplication to say that the truth is empty. In fact, it is the right view of the two truths of truth and vulgarity to say that there is something, to talk about nothing, and to talk about nothing. What is secular and sincere is the phenomenon of everything in the world; The emptiness of true meaning is the nature of everything in the world. Origin can only be empty, and nature can be empty. Origin and nature are actually two sides of the same thing, which are opposite and complementary, opposite and unified. So the origin is sexual emptiness, and sexual emptiness is the origin. For example, in the Prajna Sutra, it is said: color is empty, and empty is color, but not two, and two is not two. Different schools of Mahayana Buddhism have different interpretations of the two truths because of their different methods of inheritance or argument. Some people think that the second truth is reason, while others think that the second truth is teaching. Tiantai Sect believes that the two truths or the three truths are true and true, so it goes: "The three truths are natural and virtuous." Three schools of thought hold that the truth and the vulgarity are two kinds of true words and teachings: "The two truths are the general explanation of words and teachings, and the false name of treating each other ... only the teachings, not the context."