仅仅观察、实验、理论化和计算是不够的。人们还必须想象。

Sustainability isn't just an option; it's our responsibility to future generations.

The knowledge that you have emerged wiser and stronger from setbacks means that you are, ever after, secure in your ability to survive. You will never truly know yourself, or the strength of your relationships, until both have been tested by adversity. Such knowledge is a true gift, for all that it is painfully won, and it has been worth more than any qualification I ever earned.