The vast emptiness, the foundation of the primordial, all things begin, the five movements end in heaven, the true spirit of the atmosphere is distributed, the unified source of the earth, the nine stars hang brightly, the seven luminaries revolve, called yin and yang, called soft and hard, the subtle and the manifest are in their places, cold and heat stretch and contract, life transforms and changes, all things are clearly defined.
——Excerpt from "On the Origin of the Heavenly Principles" / "Inner Canon"