This sentence comes from Buddhism and can be said to be rich in Zen meaning. The superficial meaning can be understood at a glance, and there is no need to elaborate. The three realms of life---looking at mountains is not mountains, and looking at water is not water. The Zen master of the Song Dynasty Qingyuan Xingsi proposed the three realms of Zen meditation: at the beginning of Zen meditation, you see mountains as mountains and water as water; when you have enlightenment in Zen, you see mountains as mountains and water as water; in Zen enlightenment, you see mountains as mountains and water as water. It is still water. Buddhism pays attention to entering and leaving the world, and understanding the true meaning of Buddhism in the world. In a person's life, from the youngest child to the elderly, in the hurried journey of life, we also experience the three realms of life. The first thing in life is Chongjie: See mountains as mountains, see water as water. When we first entered the world, we were still curious and fresh about the world, and looked at everything with a childlike perspective. Everything was restored in our eyes. Baoyuan, mountains are mountains and water is water. I don’t know much about many things, but I stubbornly believe that what I see is the most real. I believe that the world is constantly running according to the set rules, and I have a believer-like attitude towards these rules. Worship eventually hits a wall in reality, causing doubts about reality and the world. The second realm of life: looking at mountains is not mountains, looking at water is not water. There are too many temptations in the world of mortals, hidden behind the mask of hypocrisy There are too many unspoken rules, and what you see may not be real. Everything is like looking at flowers in the mist. It seems real and illusory, and what seems real is fake. Mountains are not mountains, and water is not water. It is easy for us to get lost in reality. Direction, followed by confusion, hesitation, pain and struggle, some people just sink into the lost world. We begin to experience the world with our hearts, and have more rational and realistic thinking about everything. Mountains are no longer pure meanings of meaning, and water is no longer water in the pure sense of the word. The third realm of life: mountains are mountains, water is water. This is a kind of return to nature after seeing the world, but not everyone can Can reach this state. After accumulating life experience to a certain extent and constantly reflecting on it, I will have a clear understanding of the world and my own pursuit. I will realize that "the world is just a big dream, and there will be several cool autumns in life", and I will know what I want to pursue. What is it and what is it that we have to give up? At this time, the mountains are still mountains and the water is still water. It’s just that the mountains and the water have another connotation in them. "Humans are human beings, there is no need to Be a human being deliberately; the world is just the world, there is no need to be careful about how to deal with it.” This is the true way to be a human being and conduct yourself in the world.