Change refers to the works in Feng and Ya during the decline of Zhou government, as opposed to Zheng Feng and Zheng Ya. The division between righteousness and change is not based on time, but on the gain and loss of politics and religion.
It is believed that Zhengfeng and Zhengya are works in the prosperous period of the Western Zhou Dynasty, while Bian Feng and Pianya are works in the declining period of the Western Zhou Dynasty.
Interpretation by reference:
Preface to Mao's Poems, a theoretical work of China's ancient poetry. One was written by Xia Zi, a disciple of Kong Qiu, and the other was written by Wei Hong, a Han Chinese, for The Book of Songs, which is divided into big preface and small preface. The grand preface refers to the general preface of all the Books of Songs written by the author after explaining Guanju, and the minor preface refers to the preface of each of the 305 Books of Songs. Generally speaking, Preface to Mao Poetry refers to a grand preface. The author is controversial.
Guan Ju is a poem about the virtue of empresses. The beginning of The Book of Songs is used to educate the world and correct the way of husband and wife. So it can be used to educate rural people, and it can also be used to educate princes and countries. Wind is moral and enlightenment; Use fables to move and educate people.