This situation exists. But if you can't explain it clearly in one or two sentences, people who believe in fortune telling or those who don't believe in fortune telling will be one-sided. First of all, the Book of Changes has two main purposes: to calculate a person's current situation. Tell people what mentality and actions they should use to face this situation. In fact, the second use is the most valuable part of the Book of Changes. However, our descendants have infinitely magnified the first use and blindly pursued accurate calculations instead of learning that the essence of the Book of Changes is to tell people how to use appropriate mentality and actions. Facing various difficulties or peaks in life, the most typical example is "Fu Ji Tai Lai". Fu and Tai are both hexagram names in Zhouyi. The former describes a very dangerous situation, and the latter describes a stable state. It tells people not to give up when they are in despair, keep persevering, and good things will come. The eldest brother of a friend of mine committed suicide by slitting his wrists in despair in April this year, but he was rescued. His business failed three years ago. The money he earned every year was not enough to repay the interest on the loan. He felt that he had no chance to turn around and could not hold on. Unexpectedly, he recovered in June and received many new orders. He is expected to repay the loan this year. Complete the loan. If there are friends who are reading my answer in despair, I hope you will persevere. As long as people are around, there is hope, and never have the thought of committing suicide. The sun always shines through the cracks in the clouds. ?As for the use, Zhouyi has evolved many fortune-telling methods, which are collectively referred to as "numerology" in the industry. The theory is complete. Calculating a person's "fate" is not essentially different from doing a math problem. It does not contain theistic content. The so-called Good fortune telling is equivalent to completing a calculus question using rigorous reasoning. For details, you can refer to books such as "Yuanhai Ziping, Di Tiansui, and Yuding Liuren", which describe in detail how to play this thing, just like mathematics textbooks tell you theorems and let you deduce them. Through these mathematical techniques, we can roughly "calculate" information about a person's family background, innate personality, physical condition, good fortune, and where there are external injuries on the body.