Favorite plot in How Steel was Tempered (and explain why)

"How Steel was Tempered" describes Pavel Colta King, as the son of an ordinary worker, who experienced a severe life during the First World War, the October Revolution, the Civil War and the national economic recovery, and turned his spontaneous resistance to the old life into a conscious class will. Paul's growth is not "self-development of character", but as the author said when recalling his life: "Steel was tempered by raging fire and sudden cooling ... Our generation was also tempered by struggle and hard test." Life is the most precious thing for people. Life is only once for everyone. A person's life should be spent like this: looking back, he will not regret wasting his time, nor will he be ashamed of doing nothing; On his deathbed, he can say, "All my life and energy have been devoted to the most magnificent cause in the world-the struggle for the liberation of mankind."