The Tao Zang Ling Bao Bi Dharma is in the Preface to the Ling Bao Bi Dharma. Zhong Liquan's biography of Lu Yan dates from the Tu period of the Tang Dynasty to the Five Dynasties period. Original source: Taiqing Department of "Orthodox Taoist Canon". The secret biography of Zhengyang Zhenren Lingbao Bi Dharma scroll is written by Zhengyang Zhenren Zhongli Quan Yunfang in the biography of Chunyang Zhenren Lu Yandong. The four Hinayana methods of happiness and longevity are the first in matching Yin and Yang.