"Laozi Xu Zhiji" article: "Xu Zhiji, keep Du Jing, everything is United." He also said, "In the final analysis, quietness is life." He thinks that quietness is the master of movement and the foundation of life, and he doesn't want to be quiet. Quiet is the essence of Taoism. Chen Tuan's Dan method also emphasizes the concept of quietness without desire. "Jade Interpretation" quoted Chen Tuan as saying: "Yang comes from movement, while Yin comes from quietness. Yin's quietness is not real quietness, but a sigh when moving and moving. Therefore, it is endless and changeable. Everything is done, and good or bad luck comes out. The sage wrote "Yi", so it refers to good or bad luck and changes. Must be based on chastity. Therefore, the book of Yi is also a book of precepts. " Doing nothing, letting nature take its course, neither increasing nor decreasing, cultivated his mind, which became the core of Chen Tuan's inner alchemy.

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