That there are things in this world not carved out of gray stone. That there s a small place inside of us they can never lock away, and that place is called hope.
在这个世界上，有些东西用石头是刻不来的。在我们的心中有块地方是关不住的，那块地方称为自由。
要么数学对人类思维来说过于庞大，要么人类思维不仅仅是机器。
The only person you should try to be better than is the person you were yesterday.
自然界的普遍法则大多不是直接感知的对象。
Sustainability isn't an option; it's a necessity for the future of energy.
We must listen to the land and the animals—they have much to teach us about sustainable practices.