This Chapter is a section from the Yellow Emperor's Classic of Internal Medicine, specifically Chapter 78: The Spiritual Pivot – The Nine Needles. It details a traditional Chinese medicine system of nine acupuncture needles, each correlated with a cosmological element (heaven, earth, humanity, etc.) and a specific area of the body. The chapter also explores the relationship between body and mind, the five elements, and the functions of various organs and meridians, providing diagnostic and treatment principles based on these correspondences. Detailed needle types, lengths, and functions are described, along with guidelines for avoiding treatment on specific days.