在数学中，提出问题的艺术必须比解决问题更有价值。

数学不是一项观赏性运动。你必须亲自去做才能理解它。

The mind is a machine that can be understood through the principles of computation.

Well, the first rule is that you can’t really know anything if you just remember isolated facts and try and bang ’em back. If the facts don’t hang together on a latticework of theory, you don’t have them in a usable form.