我们都是时间旅行者，以生命的速度向前移动，但总是回头看。

要养活世界，我们必须先了解它。

I went to the woods because I wished to live deliberately. I wanted to live deep and suck out all the marrow of life, to put to rout all that was not life.

活着就意味着终有一死。活着就意味着每时每刻都是一个幸存者。