The author summarizes the alchemy method of the Northern School of Quanzhen Taoism, elucidates the theory of inner elixir, and believes that the way of golden elixir lies in cultivating essence, energy and spirit. The so-called "reverse" means to keep the spirit in good condition, to cultivate the form and refine the essence, to accumulate the essence to transform into qi, to refine the qi to become the spirit, and to refine the spirit to be empty, it becomes the golden elixir. In this process of refining the elixir, the most important thing is to calm down and think clearly, to understand the mind and nature, and to focus on "mind". Therefore, the author also highly praises Zen Buddhism for "pointing directly to the human heart and becoming a Buddha by seeing one's nature", and advocates the unification of the three religions. This book has certain reference value for the study of Taoist inner elixirs. It is included in the "Orthodox Taoism" Taixuan Department, and there is also a volume of "Shangyangzi Jindan Da Yao List of Immortals" and so on.
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