The preservation of the means of knowledge among the lowest ranks is of more importance to the public than all the property of all the rich men in the country.

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

一个力学问题只有被简化为代数问题时才算解决。

我不能选择那最好的，是那最好的选择我。