The purpose of life is not to be happy. It is to be useful, to be honorable, to be compassionate, to have it make some difference that you have lived and lived well.

设定新目标或做新梦想永远不会太晚。

In a time of universal deceit, telling the truth is a revolutionary act.

If you want to go fast, go alone. If you want to go far, go together.

数学不知道种族或地理界限；对于数学来说，文化世界是一个国家。

自然将人类置于两位至高无上的主人——痛苦和快乐的统治之下。