Death is really a great blessing for humanity, without it there could be no real progress. People who lived for ever would not only hamper and discourage the young, but they would themselves lack sufficient stimulus to be creative.
死亡对人类来说确实是一大幸事，没有它就不会有真正的进步。长生不老的人不仅会阻碍和打击年轻人，而且他们自己也会缺乏足够的刺激去创造。