主要的义务规则是那些要求或禁止某些行为的规则。

未来属于那些相信自己梦想之美的人。

形容世事短暂如春梦，人情淡薄如秋云。

"To write is to breathe, and to breathe is to live."

我不想成为烈士，我想成为幸存者。

I went to the woods because I wanted 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, and not when I had come to die, Discover that I had not lived.