The literary view of changing customs comes from

The literary view of changing customs comes from Preface to Shi Mao.

Preface to Mao Poetry is a theoretical work of ancient Chinese poetry. The Book of Songs of the Han Dynasty was taught by Qi, Lu, Han and Mao, and the poem was handed down by Mao Ren of Zhao. There are 305 Prefaces to Mao's Poems, among which the first preface to Guan Ju is followed by a long article, which is later called Preface to Mao's Poems or Preface to Poetry.

There are always different opinions about its author, among which there are two most influential ones: one is written by Xia Zi, a disciple of Confucius, and the other is written by Wei Hong, a Han Chinese. It is generally believed that the writing of Preface, a collection of poems by Mao Zedong, lasted from pre-Qin to Han Dynasty.

Preface to Shi Mao comprehensively discusses the theoretical issues of The Book of Songs, involving the nature, content, genre classification, artistic expression and social function of poetry. His poetics is as follows: 1. Expounds the lyricism and lyricism of poetry, which are based on emotion and unified; The second is to emphasize the social function of "beauty thorn" and "satire" of poetry, and then put forward the personality and social problems of poetry;

Thirdly, emphasize the relationship between poetry and politics and times, explain that there are different works in different times, and reveal the principle that politics, morality and customs are closely related to poetry creation; Fourthly, it puts forward the theory of "six meanings" about the classification and expression of poetry, in which style, elegance and ode are three poetic styles, and fu, comparison and xing are three techniques.