It's Du Fu's poem in memory of Li Bai. They haven't seen each other since they broke up. Du Fu admired Li Bai's poetic talent and talent, and wrote many poems to express his deep thoughts. At the end of "An Shi Rebellion", Li Bai was eager to serve his country and joined the Wang Yong shogunate. As a result, he was involved in the political whirlpool and he was personally exiled. Du Fu was deeply saddened by Li Bai's misfortune. Late autumn is just around the corner, and his worries and sadness prompted him to write this famous poem. The third triple of the poem: "A poet should beware of splendor and wealth" and "Pain breeds a poet", which means two aspects of the same problem: First, people who are too plain sailing are not easy to write good works because of their little accumulation of life and shallow thinking; However, people who have suffered setbacks and hardships in their lives can be inspired by the coldness of the world and the warmth of human feelings, and have some understanding, and good works will follow. This sentence is not only a high praise for the talented poet Li Bai, but also a comfort to him, and it is also a kind of cognition and enlightenment to Du Fu's own philosophy of life.