The former Soviet writer Ostrovsky wrote in the book "How Steel Was Tempered": A person's life should be spent like this: when looking back on the past, he will not He will not regret wasting his years, nor will he be ashamed of being mediocre; when he is dying, he can say: "My life and all my energy have been dedicated to the most magnificent cause in the world - fighting for the liberation of mankind." struggle".