"History is not what happened. History is just what historians tell us."
你最不满意的客户是你最大的学习来源。
To solve a problem, you have to be willing to think differently.
以孩子们能理解的方式写一些困难的主题是很重要的。
没有证词足以证明奇迹,除非这证词的假设比它试图证明的事实更为奇迹。
A society grows great when old men plant trees whose shade they know they shall never sit in.
I don't believe in poverty. I believe in hard work.