Things in nature are amazing, like water. Water exists in different forms. Different forms of water give us different amounts of energy. Chinese medicine has many explanations for the role of "rootless water". Rootless water is rain, dew, snow, and so on. These types of water have completely different effects on the human body. For example, dew is nourishing the eyes, rain is nourishing the bones and muscles, and snow water can play the role of nourishing the lungs. We do not yet have a scientific explanation for these effects, which I attribute to the flow and transformation of energy. This book is about the flow and transformation of energy, trying to explain the flow and transformation of energy in the human body between psychology and physiology, between individuals and families, between human and nature. There are a lot of things that science can't explain, and I think that's why Chinese medicine is so profound, because it respects that nature always maintains a balance of energy. How nature maintains its energy balance is difficult for modern science to explain. Although can not explain, but can witness. The Spring Festival of 2020 witnessed this phenomenon in a very tragic way. "The Tao Te Ching" says, "The way of heaven is to make up for what is not enough; The way of people, damage is not enough to serve." The origin of the novel coronavirus pneumonia virus has not been determined, but the prevailing view is that it originated from one of thousands of undomesticated wild animals that people eat -- bats. Our ancestors lived in jungles and grasslands and could only get food by hunting, so they domesticated animals and cultivated plants to obtain a stable food supply. This is "filling in the gaps". But with the continuous development of human civilization, human ambition and greed keep expanding. When we "lose more than we give" and destroy other creatures for our own purposes, nature makes us pay for it. The price could be plague or some other disaster. We humans think that we already rule the world, that we are the masters of the world, and can use and squander the world's resources as we please. In fact, we are too arrogant, we are a system, the universe is a system. The small human system should be subordinated to the larger cosmic system, or it will pay the price. In the book, I propose the "tree of the body", "tree of the mind" and "tree of the family", aiming at helping readers to view physical and mental health and energy flow from a holistic, connected and systematic perspective. At the moment of the epidemic, if we think about the emergence of diseases and disasters from a systematic perspective, we will find that this reflection brings us respect for the world, respect for the balance of the universe, and surrender to the law of life. Similarly, if we look at energy at the level of the system, we will find that all energy operates in the pursuit of balance. When the epidemic ravages humanity, it brings out the good in us. The tens of thousands of medical workers who rushed to Hubei without hesitation are conveying goodness, the tens of millions of people in Hubei who are staying at home in fear of death are conveying goodness, and the other Chinese who are staying at home are also conveying goodness. Finally we will see the goodness and love of more than 7 billion people around the world. As I write this, the makeshift hospital in Wuhan has just been closed, but the epidemic is still spreading in Europe. A young nurse said her wish was to take a vacation in Italy. The reporter reminded her that the situation in Italy was very serious. She said, "So I'm going! I have the experience now and I'm going to help them." We can sense a lot of energy from it. This energy will propel human beings to multiply and develop on the earth! This book is a book about mind-body medicine, but it is not just a medical book. I hope that readers of this book will learn not only how to keep themselves physically and mentally healthy, but also how to see the body and mind as one, me and you as one, us and them as one, and thus gain a deeper understanding of the root causes of our physical ailments and mental pain. The publication of this book is the culmination of many people's efforts. I would like to thank my team and especially Ms. Li Yimei. She took time off from her heavy workload of counseling and mindfulness teaching to revise the first draft of the book and bring acceptance, compassion and love to the pages.