种树的最佳时间是20年前，第二好的时间是现在。

地理学的研究是研究人与环境之间的关系。

The opening up of new markets, foreign or domestic, and the organizational development from the craft shop and factory to such concerns as U.S. Steel illustrate the same process of industrial mutation—if I may use that biological term—that incessantly revolutionizes the economic structure from within, incessantly destroying the old one, incessantly creating a new one.

在一个国家中，一个公民的自由就是所有人的自由。

我认为音乐是一种人人都能理解的语言。

数学的快乐来自于为理解而奋斗。

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。

不要害怕失败。要害怕不去尝试。

When someone really hears you without passing judgment on you, without trying to take responsibility for you, without trying to mold you, it feels damn good!

永远不要在亚洲陷入地面战争。