They are not monuments, but footprints. A monument only says, 'At least I got this far,' while a footprint says, 'This is where I was when I moved again.'

I think of a hero as someone who understands the degree of responsibility that comes with his freedom.

The two most important days in your life are the day you are born and the day you find out why.

世界上充满了神奇的事物，耐心地等待着我们的感官变得更加敏锐。

In mathematics, the art of proposing a question must be held of higher value than solving it.

如果我们想拯救自然世界，重新与自然建立联系是关键。