We think not in isolated ideas, but in continuous streams of purpose-directed activity.

"The unexamined life is not worth living."

Sustainable development requires balancing economic benefits with environmental protection.

聪明人说话，是因为有些话要说；蠢人说话，则因为要说些话。

地球资源有限，但人类的创造力无限。

生活的艺术在于知道何时坚持，何时放手。