尊重孩子正在进行的所有合理的活动并试着了解，是我们教育方法中最首要的原则。

应对不自由世界的唯一方法是变得如此绝对自由，以至于你的存在本身就是一种反叛。

You have to be willing to fail to be successful.

Leadership is the art of getting someone else to do something you want done because he wants to do it.

煤炭的未来不在于数量，而在于我们能否清洁高效地利用它。