Everything else is said by everyone, which may be misleading. Zhouyi is a book of divination, so it involves all aspects, which leads many people to ramble and exaggerate its connotation. Including the mystery of the Book of Changes, there are also many places to talk to yourself. In fact, the essence of Zhouyi lies in the ancient China culture it contains intentionally or unintentionally. Because of the original purpose of divination, China's ancient philosophical thoughts were particularly rich. The ancients need to think about how to look at heaven and earth, how to look at marriage, how to look at learning and how to look at life. The thought of Zhouyi is very different from the rational logic in the west. It is a kind of cultivation and an understanding. This kind of thing that can only be understood but not expressed is the essence of Chinese studies. So I don't recommend the mystery of the Book of Changes, which is nonsense in the name of classics.