我能计算天体运行的轨迹,但无法计算人类的疯狂。
I can calculate the motions of the heavenly bodies, but not the madness of people.
——〈民权主义第五讲〉,1924年4月20日
世界是一本书,不旅行的人只读了一页。
The most reliable way to predict the future is to invent it.