I have come to believe that a great teacher is a great artist and that there are as few as there are any other great artists. Teaching might even be the greatest of the arts since the medium is the human mind and spirit.

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.

一个人就像一个分数，分子是他实际的样子，分母是他对自己的看法。分母越大，分数越小。

Sustainability isn't a trend—it's a responsibility we owe to future generations.