可持续性不是一种风格，而是一种责任。

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.

广告的目的是销售。艺术的目的是表达。

荀子所说的“伪”，是“人为”的意思。天生就有的是“性”，是人力无法改变的；通过后天的学习、努力可以改变的，就是“伪”。所以荀子主张“化性起伪”，通过自己能掌控的力量来改变已成定数的东西。

数算练习告诉我们算术运算的原理，而不是单单的记忆和不断演算。