A lesson that Taoist priests must recite sooner or later. The full text of "Heart Seal Sutra" is four to one sentence, with a maximum of 200 words. It mainly describes Taoist cultivation methods and discusses the secrets of refining essence, energy and spirit in inner alchemy. It is believed that "the three best medicines are Shen and Qi Jing", and the relationship between Jing, Qi and Shen is "Shen is born according to shape, and Jing is dependent on Qi." It is emphasized that each person has his essence, Jing is combined with his Shen, Shen is combined with his Qi, and Qi is combined. It's true. As long as you refine your own energy and spirit, you can achieve immortality. Editor-in-chief Ren Jiyu: "Religious Dictionary" (Shanghai: Shanghai Dictionary Publishing House, 1998), page 262. Hu Fuchen, editor-in-chief: "Chinese Taoist Dictionary" (Beijing: China Social Sciences Press, 1995), page 338. Li Yangzheng: "An Introduction to Taoism" (Beijing: Zhonghua Book Company, 1989), pp. 365-366.