False facts are highly injurious to the progress of science, for they often endure long.  

The challenge of acting is to find the humanity in every character, no matter how different they may seem from you.

有时最难原谅的人是自己。

In mathematics, the art of proposing a question must be held of higher value than solving it.

你停止学习的那一刻，就是你开始落后的那一刻。

"Purpose gives meaning to mental activity."

行动是恐惧的解药。