"White hair and three thousands of feet, long sorrow" (the fifteenth part of "Song of Autumn Pu") depicts his deep and extensive worries after the failure of Chang 'an political activities;
"Poetry is a gift from the north window, and a thousand words are not worth a glass of water" (Answering the Twelve Cold Nights of the King),
"The road is as wide as the blue sky, but there is no way out before my eyes." ("Difficult to Walk"), write your own talent;
"I'd like to cross the Yellow River, but the ice will choke on the ferry, and Taihang Mountain will be covered with snow" ("Difficult to Walk"), and my writing career is difficult.