世界是一本书，不旅行的人只读了一页。

Leadership is about making others better as a result of your presence and making sure that impact lasts in your absence.

好奇心推动发现。没有它，科学就会停滞不前。

"The essence of mathematics lies in its freedom."

Mental processes are tools for living, and their worth is in their use.

实现明天的唯一限制是我们今天的疑虑。

解释：要想人爱护自己，必须先爱护别人；要想人顺从自己，必须先顺从别人。