物种之间的边界比我们想象的更具渗透性。

The strength of a state is not just its ability to coerce, but its ability to provide services and maintain legitimacy in the eyes of its citizens.

宽容是自由社会的生命要素和标志，永远不会是当权者的恩赐；在多数人暴政的普遍条件下，它只能通过激进少数派的持续努力赢得。

量子引力问题不仅是物理学的问题，也是科学哲学的问题。