Lock up your libraries if you like; but there is no gate, no lock, no bolt that you can set upon the freedom of my mind.

To teach how to live without certainty and yet without being paralyzed by hesitation is perhaps the chief thing that philosophy， in our age， can do for those who study it.

可持续发展需要平衡经济效益与环境保护。

The idea is more important than the object.

政治被认为是第二古老的职业。我逐渐意识到它与第一职业（指卖淫）极为相似。

The companies that will thrive are those that see environmental regulations as opportunities, not obstacles.

意志力不是美德，而是神经冲动的定向爆破。