智慧是对痛苦的理解，对喜悦的感激，以及对过去的接受。

那些疯狂到认为自己能够改变世界的人，才能真正改变世界。

我们都是自然的实验品。

The past is a foreign country; they do things differently there.

林业的创新不仅仅是技术，更是思维方式的转变。

写作是我唯一能呼吸的方式。

The teacher is not in school to impose certain ideas or to form certain habits in the child, but is there as a member of the community to select the influences which shall affect the child and to assist him in properly responding to those influences.