Xing: the aesthetic function of literature. Refers to the image of poetry can stimulate people's spiritual feelings and gain aesthetic enjoyment.
Viewpoint: the cognitive function of literature. Social and political situation reflected by poetry. Emotion, moral fashion, the author's ideological tendency and emotional mentality.
Group: the role of literary unity. Through interpersonal communication, poetry can unify people's thoughts, improve their understanding, express their feelings and strengthen unity.
Complain: Literature interferes with reality and criticizes social functions. The subject of "resentment" refers to the criticism of unhealthy politics in reality.
2. Source: The Analects? Yang Huo: "Confucius said: Why did Confucius learn poetry? Poetry can be aroused, observed, grouped and resented. Your father is a thing and your father is a distant thing. Learn more about the names of birds, animals and plants. "