The greatest threat to democracy is not from external enemies but from internal decay and the loss of civic virtue.

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.

爱不是胜利的进行曲，而是一声寒冷破碎的哈利路亚。

数学的真正力量在于它简化复杂事物的能力，使不可理解的事物变得可理解。