"Tao Te Ching". This work written by Lao Tzu thousands of years ago is still highly regarded by many scholars today, and it has become the first work of Taoism. It can be regarded as philosophy within philosophy. The knowledge that can be learned from the book is to warn people to reduce their desires, not to be selfish, and to sacrifice themselves for the sake of others. Just a few thousand words, but it takes a long time to understand. I highly recommend this book as a must-read in life. "Psychology and Life". Many people know the importance of psychology. Mastering psychological knowledge can be used in many fields. For example, in life, mastering the principles of emotions can help people learn to guide and control when they are in bad moods. Understanding the knowledge of sexual psychology can be of great help in educating yourself and your children. "Book of Changes". Of course, numerology books are books that you can either believe in or not. However, with the increasing development of science and technology today, many books on Feng Shui and Numerology can be released to the public, and I have never heard of any famous scholar openly opposing numerology, saying that Feng Shui and Numerology are not related to each other. Numerology is superstition. In addition, the philosophical knowledge contained in "The Book of Changes" is also a mirror that can enlighten the wisdom of life.