The only way to avoid being miserable is not to have enough leisure to wonder whether you are happy or not.

解析：真正正直的人外表反似委曲随和；真正聪明的人，不显露自己，从表面看，好像笨拙；真正有口才的人表面上好像嘴很笨。

唯有真理才是真正美丽的，唯有真理才可爱。

The first step in liquidating a people is to erase its memory. Destroy its books, its culture, its history. Then have somebody write new books, manufacture a new culture, invent a new history. Before long the nation will begin to forget what it is and what it was.

The true test of a mathematical idea is its ability to inspire further questions.

你必须能够自嘲，不要把自己看得太重。