The essence of mathematics is not to make simple things complicated, but to make complicated things simple.

Sustainability isn't a cost center - it's an investment in our collective future.

The soul needs only one thing: to do what the body is doing.

Character is doing the right thing when nobody's looking. There are too many people who think that the only thing that's right is to get by, and the only thing that's wrong is to get caught.

倘若一个人对一朵花情有独钟，而那花在浩瀚的星河中，是独一无二的，那么，他只要仰望繁星点点，就心满意足了。

可持续发展需要在经济增长与环境保护之间取得平衡。