s. The “Dao”of Laozi and “Li”of Zhuxi are all objective laws, all belong to objective idealism.

It can be said that the history of philosophy is the history of the struggle between materialism and idealism. But no one is completely correct and winner. Only their dialectical unity, that is, dialectical dualism is correct. The history of philosophy is the tortuous history of development of dialectical dualism and the dynamic balance between materialism and subjective idealism. When one of them develops itself without denying the other, it advances. When it opposes the extreme theory of the other, it progresses. When it goes into the extreme and wants to put the other side to death, it is reactionary.

The development of ontology of world philosophy is divided into three phases. Ancient philosophy is the stage of objective idealism and materialism. Subjective idealism is in the bud. Objective idealism and materialism are simultaneously produced and developed. They are indepen- dent and basically do not interfere with each other. Pythagoras, Parmenides, Plato, and Aristotle are all objective idealists.

Why were the ancient philosophers interested in studying the origin of the world? Because philosophers looked for the commonality of everything. We can deduce from common things to concrete things. Deduction requires a major premise (big premise). It requires a bigger premise to get this big premise. The biggest premise is called the origin. The origin of philosophy is not the source of the world. The source of the world is physics problem, the origin is philosophical problem, philosophy is the basis of science, they need laws of deductive relationship. 

This deductive process is a thought process from simple to complex. Because the material world is also a development process from simple to complex, much like a deductive process, so people study how to deduce from the material world, which becom