一个人的最终衡量标准不是他在舒适和便利时站在哪里，而是他在挑战和争议时站在哪里。

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.

做数学的艺术在于找到那个包含所有普遍性萌芽的特殊案例。

人生而自由，却无处不在地受着枷锁。