道德文化的最高阶段是当我们认识到应该控制自己的思想时。

They just keep trotting back and forth across the bridge thinking there is something better on the other side. If they'd hang head down at the top of the thing and wait quietly, maybe something good would come along. But no—with men it's rush, rush, rush, every minute. I'm glad I'm a sedentary spider.

Sustainability isn’t a trend; it’s a responsibility we owe to future generations.

It is to the credit of human nature, that, except where its selfishness is brought into play, it loves more readily than it hates.

To write is to rewrite, and to rewrite is to understand.