Man is born free， and everywhere he is in chains.

Leadership means making tough decisions today that will benefit future generations.

The best way to learn about poverty is to go out and talk to the poor themselves.

如果我们不考虑长期影响，开采效率就毫无意义。

如果你无法飞翔，那就奔跑；如果你无法奔跑，那就快走；如果你无法快走，那就爬行。但无论如何，你必须继续前进。