“The trouble with the world is that the stupid are cocksure and the intelligent are full of doubt.” – Bertrand Russell

“Ignorance more frequently begets confidence than does knowledge.” – Charles Darwin

“The problem with the world is that everyone is a few drinks behind.” – Humphrey Bogart

“A fool thinks himself to be wise, but a wise man knows himself to be a fool.” – William Shakespeare

“The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge.” – Stephen Hawking

“Those who think they know it all have no way of finding out they don’t.” – Leo Buscaglia

“The more I learn, the more I realize how much I don’t know.” – Albert Einstein

“In the spider-web of facts, many a truth is strangled.” – Paul Eldridge

“The shallowest rivers are the noisiest.” – Lord Halifax

“When ignorance is bliss, ’tis folly to be wise.” – Thomas Gray

“The first principle is that you must not fool yourself and you are the easiest person to fool.” – Richard Feynman

“Opinions are made to be changed – or how is truth to be got at?” – Lord Byron

“The more I study, the more I discover my ignorance.” – Voltaire

“The more you learn, the more you realize how little you know.” – Socrates

“Real knowledge is knowing the extent of one’s ignorance.” – Confucius

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

“Pride is concerned with who is right, humility is concerned with what is right.” – Ezra Taft Benson

“Confidence comes not from always being right, but from not fearing to be wrong.” – Peter T. McIntyre

“We are all born ignorant, but one must work hard to remain stupid.” – Benjamin Franklin

“To know that we know what we know, and to know that we do not know what we do not know, that is true knowledge.” – Nicolaus Copernicus

“The wise speak because they have something to say; fools speak because they have to say something.” – Plato

“The more stupid one is, the closer one is to reality. The more intelligent one is, the more one starts to invent.” – Frank Zappa

“True knowledge exists in knowing that you know nothing.” – Socrates

“If you think you’re too clever to learn from others, you’re too dumb to realize how much you still have to learn.” – John C. Maxwell

“The greatest enemy of progress is not ignorance, it is the illusion of knowledge.” – Daniel J. Boorstin

“It is better to keep your mouth closed and let people think you are a fool than to open it and remove all doubt.” – Mark Twain

“The higher the monkey climbs, the more you see of its behind.” – Joseph Sidwell Miller

“Fools ignore complexity. Pragmatists suffer it. Some can avoid it. Geniuses remove it.” – Alan Perlis

“The biggest obstacle to learning something new is the belief that you already know it.” – Ralph Waldo Emerson

“The measure of intelligence is the ability to change.” – Albert Einstein