The secret of happiness is freedom, and the secret of freedom is courage.

The only purpose for which power can be rightfully exercised over any member of a civilized community， against his will， is to prevent harm to others.

我们今天关于海洋资源的每个决定都将在未来几十年产生影响。

所以，父母、老师、国君三者，都不能当作做事的法度。 

理解的提高有两个目标：首先，我们自己的知识增长；其次，使我们能够将这些知识传递给他人。