From Nine Books of the Imperial Garden written by Bai Juyi, a poet in the Tang Dynasty. "He" is interpreted as "should" in the sentence. The general idea of this sentence is: writing articles should reflect the times and writing poems should reflect reality.
Bai Juyi believes that the value of literature and art lies in that outstanding literary works can "supplement current events" and "release human feelings" if they want to serve the real politics.
extended meaning
"Articles are combined with the times, and songs and poems are combined with each other." Measuring the literary and artistic achievements of an era ultimately depends on the works. To promote the prosperity and development of literature and art, the most fundamental thing is to create and produce excellent works worthy of our great nation and great era.
Without excellent works, other things will be more lively and fancy, which is only superficial. It can't really go deep into people's spiritual world, touch people's souls and arouse people's thoughts.
Literary and art workers should bear in mind that creation is their central task and works are the foundation. They should calm down, strive for perfection and create and dedicate the best spiritual food for the people.