最困难的是在当下富足地生活，而不让它被过去或未来玷污。

Don't be afraid to ask questions. That's how you learn.

The past is a ghost, the future a dream, and all we ever have is now.

Today is cruel, tomorrow is crueler, and the day after tomorrow is beautiful, but most people will die tomorrow night.

可持续性不是一种选择；它是我们对后代的责任。

能源的未来在于平衡盈利与责任。

每个人都是一个月亮，总有一个阴暗面，而他从来不会让人看见。

If you're trying to achieve, there will be roadblocks. I've had them; everybody has had them. But obstacles don't have to stop you. If you run into a wall, don't turn around and give up. Figure out how to climb it, go through it, or work around it.

广义相对论可能是所有现有物理理论中最美的。