It is not the mountain we conquer, but ourselves.

A sustainable future for coal depends on our ability to integrate cleaner practices without sacrificing the livelihoods of those who depend on the industry.

数学的本质不是使简单的事物复杂化，而是使复杂的事物简单化。

阅读只为心灵提供知识的材料；是思考使我们所读的东西成为我们自己的。

The only good is knowledge and the only evil is ignorance.

If you don’t believe in yourself, no one else will.