对称性不仅是自然的一种属性，而且是寻找物理定律的指导原则。

世界悬于一线，那根线就是人的心灵。

The value or worth of a man is, as of all other things, his price; that is to say, so much as would be given for the use of his power.

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

安全不是我们的优先事项，而是我们的基础。