This Chapter from The Yellow Emperor's Classic of Internal Medicine explores the principles of Nine Needles acupuncture. The dialogue between the Yellow Emperor and Qi Bo reveals that mastering these needles mirrors governing a nation, requiring an understanding of yin and yang balance and the interconnectedness of inner and outer states. The text emphasizes observing and understanding the subtle relationships between seemingly disparate elements to achieve harmony and efficacy, whether in acupuncture or governance. Successful practice necessitates discerning inner states from outer manifestations, and vice-versa. The ultimate goal is achieving a state of clear perception akin to a perfect reflection in a still, clear mirror.