“Imagine that you and I were two astronauts. We have landed on the moon, and we find that we cannot return to earth because the engine of our ship is broken beyond repair. We will run out of oxygen before the control center on earth can send another ship up to rescue us. We know that we have only two more days to live. What would you and I think of, other than going back to our dear green planet and walking side by side, in peace and without worries? Only when confronted with death do we know the precious value of our steps on the green planet.