This sentence comes from the Book of Nine and Yuan written by Bai Juyi, an advocate of the New Yuefu Movement in the Tang Dynasty. The original sentence is: "Since I came to North Korea, I have been getting older and older, seeing more and more things, asking more and more current events, watching more and more history and seeking more and more truth. Only then do I know that articles are combined with the times and poems are combined with things. At that time, when the emperor ascended the throne, there was an upright man in the slaughterhouse. He repeatedly sent letters to visit people who were seriously ill. " ?

The vernacular means that since I became an official in the imperial court, I have been getting older and experienced more and more things. Whenever you talk to people, ask more about current events, study history and explore ways to govern the country. Only then do I know that articles should be written for current events and poems should be written for reality. At that time, the emperor had just succeeded to the throne, and honest people in the government sent letters to investigate the sufferings of the people many times.

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Creative background: This is a letter essay, written in the 10th year of Yuanhe (8 15). At that time, 44-year-old Yi called himself Jiangzhou Sima. After more than ten years of officialdom turmoil, he was demoted to be a Sima in Jiangzhou, and experienced the heaviest blow in his life. His heart is full of indignation and sadness, and his thoughts are inevitably contradictory and hesitant.

At this time, I received Yuan Zhen, a good friend of Tongzhou Sima at that time, "Narrating Poems and Sending Music Day". I'm thinking, and I feel it. I wrote this long letter with rich content and sincere feelings in a remote town in the cold winter. The new Yuefu movement initiated by Bai Juyi and Yuan Zhen was called "Bai Yuan" by the world.

On the basis of absorbing the poetry creation theories of predecessors and contemporary writers, this paper develops them, forms its own poetry theory program, and summarizes his experience in creating political allegorical poems. It has a distinct point of view, vivid and fluent words and strong persuasiveness, and occupies an important position in the history of China's literary criticism.