The most precious thing for a person is life. Life belongs to people only once. A person's life should be spent like this: when he looks back on the past, he will not regret for being inactive and wasting his years, nor will he feel guilty for being despicable and living a mediocre life. In this way, when he is dying, he can say: 'I have dedicated my entire life and all my energy to the most magnificent cause in the world - the struggle for the liberation of mankind.