In a very high and very microscopic dimension of the universe, there exist two different kinds of substances. They are two forms of material existence manifest by the supreme characteristic of the universe—Zhen-Shan-Ren, at certain levels of dimensions in the universe. They pervade certain dimensions from the top to the bottom or from the microscopic level to the macroscopic level. With regard to the Fa’s manifestations at different levels, the lower the level, the greater the difference in the manifestations and variations of these two different kinds of substances. As a result, it brings forth what the Tao School calls the principles of Yin-Yang and Taiji. Descending further to lower levels, these two kinds of matter, with different properties, become increasingly opposed to each other, and this then gives rise to the principle of inter-generation and inter-inhibition.

Through inter-generation and inter-inhibition there appear kindness and malevolence, right and wrong, and good and evil. Then, as to living beings, if there are Buddhas, there are demons; if there are humans, there are ghosts—this is more obvious and complicated in ordinary human society. Where there are good people, there are bad ones; where there are selfless people, there are selfish ones; where there are open-minded people, there are narrow-minded ones. In terms of cultivation practice, where there are people who believe in it, there are people who do not; where there are people who can be enlightened, there are people who cannot; where there are people for it, there are people against it—this is human society. If everyone could practice cultivation, be enlightened to it, and believe in it, human society would turn into a society of gods. Human society is simply a society of human beings, and it is not allowed to cease to exist. Human society will continue to exist forever. Therefore, it is normal that there are people who oppose it; if, instead, no one objected, it would be abnormal. Without ghosts, how could humans be incarnated into humans? Without the existence of demons, one would be unable to cultivate Buddhahood. Without bitterness, there could not be sweetness.

Precisely because of the existing principle of inter-generation and inter-inhibition, people will come across difficulty when trying to accomplish something. Only when you succeed in accomplishing what you want by making bitter efforts and overcoming difficulties will you find it not easily won, cherish what you have achieved, and feel happy. Otherwise, if there were no principle of inter-generation and inter-inhibition and you could effortlessly accomplish anything, you would feel bored with life, without a sense of happiness or the joy of success.

Any kind of matter or life in the universe is composed of microscopic particles that make up larger particles, and these then form surface matter. Within the scope covered by these two kinds of matter of differing properties, all matter and lives possess dual nature just the same. For instance, iron and steel are very hard, but they will become oxidized and rusty when buried in the earth. Pottery and porcelain, on the other hand, will not become oxidized when buried in the earth, but they are very fragile and can be easily broken. The same applies to human beings, who possess Buddha-nature and demon-nature at the same time. What one does without moral obligations and constraints is of the demon-nature. Cultivating Buddhahood is to eliminate your demon-nature and solidify your Buddha-nature.

One’s Buddha-nature is Shan, and it manifests itself as compassion, thinking of others before doing anything, and the ability to endure sufferings. One’s demon-nature is viciousness, and it manifests itself as killing, stealing and robbing, selfishness, evil thoughts, sowing discord, stirring up troubles by spreading rumors, jealousy, wickedness, anger, laziness, incest and so on.

Being the characteristic of the cosmos, Zhen-Shan-Ren manifests differently at different levels. The two different kinds of substances within certain levels of the universe also have different manifesting forms at different levels. The lower the level, the more marked the inter-opposition, and thus the division between good and bad. The virtuous becomes more virtuous, while the evil becomes more evil. The dual nature in the same physical subject also becomes more complicated and changeable. This is exactly what Buddha stated: everything has Buddha-nature. As a matter of fact, everything has demon-nature as well.

Nevertheless, the universe is characterized by Zhen-Shan-Ren, and so is ordinary human society. The two kinds of substances I have mentioned are among numerous kinds of matter that exist from the top to the bottom, from the microscopic level to the macroscopic level, to until human society, and they are nothing but two kinds of dual nature producing substances that manifest in life and matter. But lives and matter from the top to the bottom until human society are composed of countless varieties of matter from the microscopic level to the macroscopic level.

If mankind does not observe human moral standards, society will be in uncontrollable chaos, with natural calamities and man-made disasters. If a cultivator does not get rid of his demon-nature through cultivation, his gong will be messed up very badly and he will attain nothing or follow a demonic path.