What is happiness? It is the concern, leisure and pursuit of the poet.

It is the concern of poet Li Bai that "no one can miss the national conditions in this nocturne", the leisure of poet Yuan Zhen that "autumn shrubs are like Taoist priests, and the hedges are getting more and more inclined", the pursuit of poet Liu Yuxi that "a crane in the clear sky leads a poem to the blue sky" and the poet Su Shi's "wishing people a long journey of thousands of miles".