最终，我们记住的不是敌人的话语，而是朋友的沉默。
"In the end, we will remember not the words of our enemies, but the silence of our friends."
"The world is a book, and those who do not travel read only one page."
The true value of a mathematical theory lies in its ability to connect seemingly unrelated ideas.
"The library is inhabited by spirits that come out of the pages at night."
Those who cannot remember the past arecondemned to repeatit.