During the Qianlong period of the Qing Dynasty, the book Singing the Truth was engraved. According to the records in the book, the book was handed down by the old man of Qinghua, compiled by Crane. Singing the Truth is a masterpiece in the study of Neidan's books, which tells the story of refining the heart, alchemy and shaping. Among them, meditation is the main method, emphasizing that "people should first see immortality, and then practice immortality." "cultivate your mind", if you cultivate your mind clearly, you can see your own nature, that is, "clear your mind and see your nature"

The method of retreat is to get rid of illness and prolong life, and the key point of retreat is that things are safe without me; The characteristics of retreat are that once you get started, natural and wonderful ideas come one after another, and you can't help but have your own true guidance; The key to successful retreat is "a thief in the porch". With this sense of stillness and movement, you will succeed in self-cultivation.

The Taoist documents "Yong Huai Zhen Yan", "Biography of the Old Man in Tsinghua" and "Compilation of Qinghe Crane" all use poems to express the concept of health preservation. That is, immortality is the goal of Taoist practice. Taoism advocates extending the length of life and improving the quality of life through cultivation, so as to achieve the eternity of life. Monks treat secular life with a pure and inaction attitude, practice with the spirit of "my life is in my absence", practice through various Taoist techniques, and integrate with Taoism.