居家时不是有才德的人，入朝做官也不是好官。小时候不是一个好的学生，将来不能够成为一个有才德的人。

Hard work beats talent when talent doesn't work hard.

历史学家的首要职责是忠于真相。

The success of any political system depends on its ability to generate legitimacy in the eyes of its citizens.

The only way to deal with an unfree world is to become so absolutely free that your very existence is an act of rebellion.

唯一的失败是不去尝试。

在科学中，最重要的不是获得新的事实，而是发现思考它们的新方法。