每天都努力比醒来时更聪明一点。
Spend each day trying to be a little wiser than you were when you woke up.
一个人能成为什么，他就必须成为什么。这种需求我们称之为自我实现。
追求知识是一场没有终点的旅程。
In mathematics, the journey of discovery is as important as the destination.
The limits of my language mean the limits of my world.
One can't proceed from the informal to the formal by formal means.
Coal is not just a commodity, it's a commitment to America's future.
Success is the sum of small efforts, repeated day in and day out.