"Success comes from knowing what you don't know more than from knowing what you do know."

"Knowing how to deal well with not knowing is far more important than knowing."

"Education without values, as useful as it is, seems rather to make man a more clever devil."

"A proud man is always looking down on things and people; and, of course, as long as you are looking down, you cannot see something that is above you."

"Don't judge a man by where he is, because you don't know how far he has come."

"A young man who wishes to remain a sound atheist cannot be too careful of his reading."