② refers to natural phenomena and laws such as the sun, moon and stars. Su Wen's Five Movement Theory: "On the movement of heaven and earth, the gods are the discipline." Su Wen Shifting Essence and Changing Qi: "This is what God values, so it is suitable for immortals."
3 mystery, mystery. Su Wen's Theory of Yin and Yang: "Yin and Yang are the way of heaven and earth, the discipline of all things, the parents of change, the beginning of life and death, and the home of all gods."