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

The most important thing in science is not to solve problems, but to ask the right questions.

The tyranny of a prince in an oligarchy is not so dangerous to the public welfare as the apathy of a citizen in a democracy.

没有内容的思想是空洞的，没有概念的直觉是盲目的。