The best way to be happy is to let go of what you can’t control.

The purpose of abstraction is not to be vague, but to create a new semantic level in which one can be absolutely precise.

只有小孩子知道自己在找什么。他们把时间花费在布洋娃娃身上。因此对他们而言，洋娃娃就变得很重要。一旦有人将娃娃拿走，他们就会号啕大哭。

Well, the first rule is that you can’t really know anything if you just remember isolated facts and try and bang ’em back. If the facts don’t hang together on a latticework of theory, you don’t have them in a usable form.

做出伟大工作的唯一方法就是热爱你所做的事情。