“The man who is a pessimist before 48 knows too much; if he is an optimist after it he knows too little.”

“There is no sadder sight than a young pessimist, except an old optimist.”

“The trouble with the world is not that people know too little; it's that they know so many things that just aren't so. ”

“In Boston they ask, how much does he know? In New York, how much is he worth? In Philadelphia, who were his parents?”

“A man is accepted into a church for what he believes and he is turned out for what he knows.”

“I don't know anything that mars a good literature so completely as too much truth. Facts contain a great deal of poetry, but you can't use too many of them without damaging your literature.”

“The less a man knows the bigger the noise he makes and the higher the salary he commands.”