物理学和数学之间的界限并不像我们想象的那么清晰。

我不是榜样，我是那些不相信榜样的人的榜样。

It seems to me that if you or I must choose between two courses of thought or action, we should remember our dying and try so to live that our death brings no pleasure to the world.

不要担心别人不理解你，要担心你不理解别人。