无力感会腐化。绝对的无力感会绝对地腐化。

挑战让我们成长；用勇气和决心去迎接它们。

You can never know anyone as completely as you want. But that’s all right, love is better.

问题的数学表述通常比其解决方案更重要，后者可能仅仅是数学或实验技巧的问题。

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.