If you're not stubborn, you'll give up on experiments too soon. And if you're not flexible, you'll pound your head against the wall and you won't see a different solution to a problem you're trying to solve.

心理过程是大自然解决生活问题的方式。

数学直觉就像肌肉一样 - 通过锻炼会变得更强大。

生活是一场冒险，不是一次包办旅行。

度过生活的唯一方法就是笑着度过。你要么笑，要么哭。我更喜欢笑。哭会让我头疼。

I think the best thing you can do is to be grateful for what you have.

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.