I am always glad to think that my education was, for the most part, informal, and had its roots in the real world.
我总是很高兴地想到,我的教育大部分是非正式的,并且根植于现实世界。
In science, the credit goes to the man who convinces the world, not to the man to whom the idea first occurs.
You don't have to hold a position to be a leader.
The more one forgets himself—by giving himself to a cause to serve or another person to love—the more human he is.
Every challenge is an opportunity in disguise.