石油的真正价值在于它改变经济和社会的能力。

Always forgive your enemies; nothing annoys them so much.

即使学术再精湛，如果道德不足，就像在流沙上建造高楼，稍有震动就会倒塌。

"I’m not perfect. I make mistakes like everyone else."

真相并不总是美丽的，美丽的话语也不一定是真相。

Sustainability starts with small steps, but requires big vision.

A pessimist sees the difficulty in every opportunity; an optimist sees the opportunity in every difficulty.