The most important thing in science is not so much to obtain new facts as to discover new ways of thinking about them.

Efficiency is highly overrated； Goofing off is highly underrated. Regularly scheduled sabbaths， sabbaticals， vacations， breaks， aimless walks and time off are essential for top performance of any kind. The best work ethic requires a good rest ethic.

一八一四年，俄、奥、普联军兵临巴黎城下，理工学校学生要求参战。面临灭顶之灾的拿破仑却说：“我不愿为取金蛋杀掉我的老母鸡！”后来，这句名言被刻在巴黎理工学校梯型大教室的天花板正中心，一直激励着该校师生奋发好学。

数学的美在于它是一种可以以其他任何方式都无法描述宇宙的语言。

挑战不在于代表非洲，而在于呈现非洲的复杂性。

国用过少，则金价低了，金价低则各项事业不好办，故对事业不利。