2, clean, refers to a clean heart, people understand the world around them through the eyes, ears, nose, tongue and body, but the heart should be clean, don't go with the flow, for example, when a girl meets you, your brain is beautiful and ugly, so how about being a wife for yourself? This is not a pure heart. .
3. The Three Realms refer to the Desire Realm, the Color Realm and the Achromatic Realm. You can check the three realms of heaven and man table, which has a detailed description. .
4. Everything is empty, and the five elements refer to gold, wood, water, fire and earth in China traditional culture. If you want to ask the origin of the five elements, you can only say that it is because of human curiosity. Our ancestors have been exploring the composition of matter. At first in the west, they proposed that the world consists of these four elements, namely, earth, water, fire and wind. The Five Elements and the Book of Changes appeared in the East. The Book of Changes is divided into eight directions: Gan, Kun, Zhen, Xun, Kan, Li, Gen and Right, symbolizing "Heaven, Earth, Thunder, Wind, Water, Fire, Mountain and Ze". This development process is generally called the era of simple materialism in the history of philosophy.
Returning to the origin, people are exploring the composition of matter. Because of the original idea of "Four Great Elements and I Ching", people began to make materials, so alchemy appeared in the East and alchemy appeared in the West. From this point of view, orientals pay attention to health preservation and tend to explore life more, while westerners tend to benefit more.
Of course, these methods did not produce a panacea, such as Qin Shihuang's Hanwu Yongzheng and so on, and a large number of emperors eventually died in an alchemy. In the same way, the west did not make gold through earth, water, fire and wind.
This is why modern chemistry came into being and atomism was put forward. . From then on, Hume Crick was immortalized.
I'm exhausted, I've written so much!