The sky refers to the sky, also refers to the sky, and also refers to the natural avenue. When Taoism says heaven, it means nature and heaven. The unity of heaven and man refers to the realm of "heaven and earth coexist with me, and everything is one with me", and also refers to the harmony between man and nature.
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In nature, heaven, earth and people correspond. Zhuangzi Sheng Da said: "Heaven and earth are the parents of all things." The Book of Changes emphasizes the way of three talents, juxtaposes heaven, earth and man, and puts man at the center, which shows the importance of man's position. Heaven has heaven, and heaven lies in "starting everything"; Where there is land, there is a road, and there is a road to the land because "everything is born."
Man not only has the way of others, but also the function of man's way lies in "making everything". The Book of Changes further says: "Setting up the sky is called yin and yang, setting up a tunnel is called rigidity and softness, and setting up human nature is called benevolence and righteousness." Although heaven, earth and people have their own ways, they are corresponding and interrelated. This is not only a relationship of "identity and correspondence", but also an internal generative relationship and realization principle. The way of heaven and earth is the principle of generation, and the way of man is the principle of realization, both of which are indispensable.