Every tree we plant today is an investment in tomorrow's clean air and healthy ecosystems.

Freedom without justice is tyranny.

安全不是产品，而是一个过程。

"Books are the way that we communicate with the dead. The way that we learn lessons from those who are no longer with us, that humanity has built on itself, progressed, made knowledge incremental rather than something that has to be relearned, over and over."

世界只存在于你的眼中。你可以让它变得很大，也可以让它变得很小。