“The test of a first-rate intelligence is the ability to hold two opposed ideas in the mind at the same time, and still retain the ability to function.” — F. Scott Fitzgerald

“It is the mark of an educated mind to be able to entertain a thought without accepting it.” — Aristotle

“Education enables you to express assent or dissent in graduated terms.” — William Cory

“Education is the ability to listen to almost anything without losing your temper or your self-confidence.” — Robert Frost

“To change an opinion without a mental process is the mark of the uneducated.” — Geoffrey Madan

“To have doubted one’s own first principles is the mark of a civilized man.” — Oliver Wendell Holmes