"I don't think about the past. I don't think about the future. I just think about now."

War is an ugly thing， but not the ugliest of things: the decayed and degraded state of moral and patriotic feeling which thinks that nothing is worth a war， is much worse.

写作是探索灵魂未知领域的过程。

学习数学的唯一方法就是做数学。

The interplay between analysis and algebra is the driving force behind many breakthroughs in number theory.