盖亚的概念并非人类的构想，而是源自地球本身。

解释：不注意天时，财富就不能增长；不注意地利，粮食就不会充足。

Writing is a way of bearing witness to the world.

Persistence is key in mathematical research; many great results come from looking at the same problem from different angles over and over again.

地球上最小的少数群体是个人。那些否认个人权利的人不能声称是少数群体的捍卫者。