在采矿业的成功不仅仅在于资源的开采，还在于负责任地创造价值。

唯一真正的天堂是我们已经失去的天堂。

数学中真正的挑战不是解决问题，而是提出正确的问题。

When people talk to us about others, they are usually dull. When they talk to us about themselves, they are nearly always interesting.