真相很少是纯粹的，也绝不简单。

一个人只有通过尽可能少说谎来尽可能少说谎，而不是通过尽可能少的机会来做到这一点。

You can always juice sales by going down-market, but it's hard to go back upmarket.

Facts are stubborn things; and whatever may be our wishes, our inclinations, or the dictates of our passion, they cannot alter the state of facts and evidence.

Mathematics is not a spectator sport. You have to get involved.