农民是最早的环保主义者；他们的日常决策对我们的地貌影响比任何政策都大。

I must study politics and war that my sons may have liberty to study mathematics and philosophy.

You have to be able to admit when you’re wrong and get out of a losing position quickly. The worst thing you can do is hold onto a losing trade hoping it will come back.

解释：知道房屋漏雨的人在房屋下，知道政策有失误的人在民间，知道经书错误的人在诸子。

To paint is to pray with the hands.

效率能够让你做到你以前不曾做到的事情。