This sentence comes from the Yellow Emperor Yin Fujing, which uses metaphors to discuss health preservation, but fools don't pay attention to it. It is far from the point that Sun Tzu's Art of War or Su Qin's "Tai Gong Yin Fu Zhi Ji". For example, The Pure Yang Plays the True Classics, and the Emperor Blesss, the whole article is written in military terms, and people who don't know it will recognize it as a military book at first glance.

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The author of Yin Fu Jing has always had different views. * * * There are four views: the first view is that it was written by the Yellow Emperor, and Yi Yin, Taigong, Fan Li, Gui Guzi and others made comments. The second view is that it was written by Kou in the Northern Wei Dynasty. According to Du Guangting's Biography of Immortal Experience, this book is called "the famous mountain hidden by Kou, a Taoist priest in Shangqing".

As a highly refined Taoist classic, The Yellow Emperor Yin Fujing, like the works of many Taoist scholars with rational spirit, does not simply follow the words of Yi-ology, but uses the rational thinking of Yi-ology.

Baidu Encyclopedia-Yin Fu Huangdi Neijing