人类的思想和行为是自然的一部分，因此可以通过自然科学的方法来研究。

Failure gave me an inner security that I had never attained by passing examinations. Failure taught me things about myself that I could have learned no other way. I discovered that I had a strong will, and more discipline than I had suspected; I also found out that I had friends whose value was truly above the price of rubies.

Sustainability is not a choice, it is a responsibility.

当一个人不能再拥有的时候，他唯一能做的便是不要忘记。