From
毛泽东's 1917 couplet
自信人生二百年,
会当水击三千里 - 'I trust that life lasts two hundred years; I shall beat the waters for three thousand li.' The young Mao wrote it while a student at Hunan First Normal School, paraphrasing
庄子's giant Peng bird in
《逍遥游》. The line projects romantic, almost reckless confidence in his own longevity and ambition.