The sparrow knows the ambition of the swan. It means how can a sparrow know the lofty ambitions of a swan, and it is a metaphor for how ordinary people can know the ambitions of heroes. When Chen Sheng was young, he was hired to plow the land with others. He said: "If one day we become rich, don't forget each other." His companions smiled and replied: "You work as a hired worker to plow the land for others. How can you be rich?" Chen Sheng sighed and said, "Oh, how does the sparrow know Honghu's ambition of soaring into the clouds?" It means that powerful and noble people are born nobler than others? The nobles of princes, generals and ministers are all made by their own hard work. We should dare to revolt to change our own destiny. It shows Chen Sheng's unwillingness to accept his fate, his dissatisfaction and resistance to the unfairness of his fate.