The purpose of quoting this sentence is: Comrade Zhang Side keeps in mind the purpose of the revolutionary team, lives to work for the interests of the people, and dies for the interests of the people, which embodies the spirit of completely and thoroughly serving the people. Because he died for the benefit of the people, although he did not do anything earth-shattering in his life, his death was meaningful and valuable, so he is said to be "heavier than Mount Tai."