This sentence comes from Ostrovschi's How Steel was Tempered. It means you won't regret wasting your time, and you won't be ashamed of doing nothing. Life is the most precious thing for people. Life belongs to people only once, and people's life should be spent like this.

How Steel was Tempered is a novel written by Nikolai Alexeevich Ostrovsky, a writer of the former Soviet Union, based on his personal experience. The road taken by Paul, the hero, embodies the dauntless spirit of the first generation of revolutionary young people in the Soviet Union who are not afraid of difficulties, struggle hard and have the courage to win, and inspires generations of aspiring young people to realize their ideals. The image of his novels transcends time and space, transcends national boundaries, has worldwide influence, and shakes the heartstrings of generations. Soon after the novel came out, it was adapted into movies and stage plays and spread all over the world.