Standing on the river bank, Confucius said that the past is like running water, running day and night. This sentence is from The Analects of Confucius, Zi Han. The original text is Confucius: The deceased is like a husband! Don't give up day and night Confucius said by the river, "The swift river is so swift! It flows day and night. " The traditional explanation of "the deceased is like a husband, staying up all night" is Zhu's Notes on Four Books and Sentences. From the standpoint of Neo-Confucianism, Zhu summed up the meaning of this sentence in four words, that is, to keep learning. This explanation is still very instructive for our current learning attitude. Confucius' original intention also contains this meaning, which is consistent with Confucius' attitude of "never getting tired of learning" all his life. But this is the essence of Confucius' thought when he inspects the universe and touches everything, which has more universal significance, that is, to cherish time. Time is like running water, it flows quietly around us, and we lose our best time carelessly. The so-called youth is fleeting and difficult. This is a fact. This sentence always reminds us to cherish time, especially in modern fast-paced life.