This Chapter is a dialogue from the Yellow Emperor's Classic of Internal Medicine, specifically Chapter 70, "The Great Treatise on the Five Constant Policies." The Yellow Emperor questions Qi Bo about the principles of balance (equilibrium) within the five phases (Wood, Fire, Earth, Metal, Water), exploring their states of deficiency, normalcy, and excess. The discussion expands to encompass seasonal influences, geographical factors, disease treatment based on these principles, and the interplay of internal organ energies. Finally, the conversation addresses issues such as infertility and the importance of timing in treatment.