数学不是沿着一条清理得很好的高速公路小心行进，而是进入一个陌生的荒野的旅程，探险者常常会迷路。

The laws of nature are unforgiving.

图画书就像是可以捧在手心里的小艺术品。

I think goals should never be easy, they should force you to work, even if they are uncomfortable at the time.

数学中最深刻的见解往往来自最抽象的理论。

一个人笑的时间是与众神共度的时间。