What does Yan Yu think is the poet's most essential thing?

Yan Yu believes that the essence of a poet is "enlightenment", which is an aesthetic intuitive thinking. "Knowledge" is the aesthetic ability, that is, the ability to distinguish between good and bad poetry. Yan Yu believes that the study of poets in the prosperous Tang Dynasty should start with "knowledge", cultivate good aesthetic ability, form correct concepts of poetry appreciation and poetry creation, and finally reach the psychological state of "wonderful enlightenment".