1, Human Law: People live in the world and are bound by the earth. The most direct example is gravity;

2. Earth and the sky: The earth is bound by the sky (sun and moon) that we look up to see. The most direct examples are tides, seasons and solar terms.

3. Heaven: The environment of heaven is bound by the Tao. What is Tao? It can be understood as the universal and general operation law of the universe. For example, the moon revolves around the earth according to a certain trajectory and cannot be separated. The earth goes around the sun, and the sun goes around the Milky Way.

4. Taoism is natural: this law in the universe is not set by human beings, nor created by God, nor controlled by God, but natural, that's all.