如果我们能找到自然的弱点，就能征服它。

不要害怕放弃好的，去追求伟大的。

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.

知识最大的敌人不是无知，而是知识的幻觉。