In Ouyang Xiu's "New History of the Five Dynasties? Preface to the Biography of Lingguan", the sentence that warns people to be prepared for danger in times of peace is: "Worry and labor can rejuvenate the country, and leisure and leisure can destroy the body. This is the law of nature."

Through a specific analysis of the rise and decline of the Tang Dynasty during the Five Dynasties period, this article concludes that "worry and labor can rejuvenate a country, and leisure and hesitation can destroy one's life." This article shows that rise and fall are not determined by destiny but by "human affairs," and it is used to warn people to learn from History teaches us to be prepared for danger in times of peace and to guard against arrogance and extravagance.

Sorrow: worry and hard work.

Xingguo: Make the country prosperous.

Yiyu: Coveting for ease and enjoyment.

Death: loss of life.

Natural way: This is a very natural truth.

This sentence appears in the second half of the article. The author switches from narrative to theory, and the argument is deepened step by step, and the idea is advanced layer by layer. From "The Book says: 'Fullness will cause harm, modesty will gain'" naturally leads to the argument that "worry and labor can rejuvenate the country, and leisure and hesitation can forget oneself." In order to enhance the persuasiveness of this argument, the author condenses Zhuangzong's gains and losses in the world into a concise and parallel text to refute this argument. Once again, through the strong contrast of one's rise and one's decline, it forms a back-and-forth echo with the argument at the beginning of the chapter. The echo makes the central argument of this article more vivid and prominent.