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A classic for refining inner elixirs. Three volumes. Written by Zhongli Quan of the Five Dynasties, biography of Lu Yan. It was probably written in the Five Dynasties and later Han Dynasty. Zhongli Quan, courtesy name Yunfang, nicknamed Zhengyangzi, No. 1 Heguzi. His birth and death place of birth is unknown. According to "The Legend of Immortals", Zhongli Quanjing was born in Xianyang (or Yantai). The official Han was a general. After his defeat, he fled to Zhongnan Mountain. He met Emperor Xuanfu of Donghua and taught him the Tao. "I harvested thirty volumes of "Lingbao Sutra" from the stone wall, the upper part is written by Yuanshi, the middle part is written by Yuanshi, the middle part is described by Emperor Yuan Dynasty, and the lower part is the true meaning, passed down by Taishang, a total of thousands of words." This book is in the style of quotations. Each article lists the discussions in "Yushu", "Zhenyuan", "Zhenjue", "Daoyao", "Jingao" and other books, with occasional annotations. The author divides Taoist alchemy into 3 categories and 10 methods: The Hinayana method of peace and happiness and longevity, the Middle Vehicle method of immortality, and the Mahayana method of transcending ordinary people. The theory of inner alchemy qigong is explained based on the principles of the creation of the universe and the evolution of yin and yang.