The most precious thing for a person is life. Life is only once for a person. Therefore, a person's life should be spent like this: when a person looks back on the past, he will not regret for wasting his years, nor will he regret for wasting his life. In this way, when he is dying, he can say that I have dedicated my whole life and all my energy to the most precious cause in life - fighting for the liberation of mankind. We must live in a hurry because even a sudden illness or accident can end our lives.