Who put forward the idea that articles should be combined with the times and poems should be combined with things?

It was put forward by Bai Juyi, a writer in Tang Dynasty. The phrase "articles are written for the times and poems are written for things" means that articles are written for the times and poems are written for reality. It is of practical significance and value to emphasize that literary works reflect the characteristics of the times and social reality. This view reflects Bai Juyi's emphasis on the social responsibility and practical significance of literature, which has a far-reaching impact on later literary creation.