The world perishes not from bandits and fires, but from hatred, hostility, and all these petty squabbles.

Not necessarily your mother, or indeed mine, but, as it were, the ideal mother, somebody who doesn't care about your achievements. Unfortunately, most people are not our mothers. Most people make a strict correlation between how much time, and if you like, love -- not romantic love, though that may be something -- but love in general, respect --they are willing to accord us, that will be strictly defined by our position in the social hierarchy.

最好的数学不仅仅是逻辑的；它是直观和创造性的，将严谨与想象力结合在一起。

未来是一个黑暗的虚空，我们都在盲目地朝它跌跌撞撞地前进。

Buying tools: Start by buying the absolute cheapest tools you can find. Upgrade the ones you use a lot. If you wind up using some tool for a job， buy the very best you can afford.

Turn your wounds into wisdom.