's “tao”, Zhu Xi's “li”. They are so varied and strange and they are all said to be transcendental, that is, they must be true, they do not need to be tested. However, these strange and abstract things cannot be true at the same time. How to distinguish them? What are the methods and standards to distinguish? These problems have always been unsolvable by objective idealism.

The development of modern philosophy epistemology is to solve these problems. However, in the development of epistemology, people seem to have forgotten this original intention. Few people seriously criticize objective idea- lism. The most important thing is that they do not recognize the essence of objective idealism. Materialism, subjective idealism, and objective idealism all have problems, but the nature of the problem is completely different. Some are problems in development that can be tolerated, some are intolerable, and completely violate the scientific spirit. Philosophy can not develop without these problems thoroughly solved, just as religious philosophy and scholastic philosophy must be completely abandoned, their values are only historical values. Although some of them have important inspirations for the development of modern philosophy, they must not be allowed to resume. Many concrete theoretical achievements of objective idealism have a certain theoretical value, but their basic viewpoints are totally wrong and they cannot be tolerated. Understanding the essence of objective idealism is a necessary condition for the development of philosophy ontology. But now objective idealism is still powerful, not only do many great philosophers insist on objective idealism, but many subjective idealists (including many schools of positivism, pragmatism, and analytical philo- sophy) and materialists often slip towards objective idea- lism unconsciously.

Realism is opposite to nominalism. Nominalism holds that abstract things are not objective, they are the consciousness in people's minds. This notion of nominalism is correct. The objective world has only concrete things and no abstract things.