The best books are those that challenge you.

Freedom is not merely the opportunity to do as one pleases; neither is it merely the opportunity to choose between set alternatives. Freedom is, first of all, the chance to formulate the available choices, to argue over them - and then, the opportunity to choose.

 整个言语行为包括发声的行为和表达意义的行为。

真相很少是纯粹的，也从不简单。

Make no mistake about it: Computers process numbers - not symbols. We measure our understanding (and control) by the extent to which we can arithmetize an activity.

唯一能拯救我们的是停止害怕。

宇宙是一个谜题，每一次发现都是让我们更接近完整画面的一块拼图。