Recently, I have been watching Ceng Shiqiang's lecture on the Book of Changes. It is very suitable for analyzing problems with the concept of gossip. Sometimes we like to argue about who comes first. We sometimes ignore the fact that the two are a yin and a yang, and they roll forward together. Yin and Yang are inseparable, but they are a whole. The people are rich and the country is strong. Originally, this is a constantly changing process. You can only explain a temporary state, but you can't explain a constantly changing state. You gossip, or two colors are neither too much nor too little. My point is that the people are neither rich nor strong, they are a whole.