The poet deeply understands that the essence of sorrowful autumn in ancient times is that people with lofty ideals are frustrated, disappointed with reality and pessimistic about the future, so they only see the depression in autumn and feel lonely and lifeless. The poet sympathizes with their experience and situation, but disagrees with their pessimism and disappointment. In response to this feeling of loneliness, he said that autumn is better than the spring when all things sprout and flourish, emphasizing that autumn is not lifeless, but very lively. He guided people to see cranes flying high. In the clear autumn sky, the clouds are straight up, vigorous and powerful, and promising. Obviously, this crane is unique and lonely. But it is the tenacious struggle of this crane that broke through the cold breath of autumn, created a new scene for nature, and filled people with lofty ideals with vitality. This crane is the embodiment of indomitable spirit and struggling spirit. Therefore, the poet said, "Then bring poetry to Bixiao". "Poetry expresses ambition" and "poetic sentiment" is ambition. If people are really ambitious, they will have the spirit of struggle and will not feel lonely. This is the theme of the first poem.