"Few are those who can see with their own eyes and hear with their own hearts."

-Albert Einstein

"To be ignorant of one’s own ignorance is the malady of the ignorant."

-Amos Alcolt

"It is impossible to make someone understand their own ignorance, for it requires knowledge to perceive it; and, therefore, he that can perceive it has it not."

-Jeremy Taylor

"It is difficult to free fools from the chains they revere."

- Voltaire

"To act without clear understanding, to form habits without investigation, to follow a path all one's life without knowing where it really leads; such is the behavior of the multitude."

-Mencius

“To most people, nothing is more troublesome than the effort of thinking.”

-James Bryce

“Common sense is not a common virtue.”

"Education is a progressive discovery of our own ignorance."

- Will Durant

"There's lots of people.... this town wouldn't hold them; who don't know much excepting what's told them."

- Will Carleton

"A weak mind is like a microscope, which magnifies trifling things, but cannot receive great ones."

-Lord Chesterfield

"Young men are apt to think themselves wise enough, as drunken men are apt to think themselves sober enough."

-Lord Chesterfield

"Real knowledge is to know the extent of ones own ignorance."

- Confucius

"The first step to knowledge is to know that we are ignorant."

-Cecil

"Few people think more than two or three times a year; I have made an international reputation for myself by thinking once or twice a week."

- George Bernard Shaw

"Fullness of knowledge always means some understanding of the depth of our ignorance; and that is always conducive to humility and reverence."

- Robert Millikan