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“Moral certainty is always a sign of cultural inferiority. The more uncivilized the man, the surer he is that he knows precisely what is right and what is wrong. All human progress, even in morals, has been the work of men who have doubted the current moral values, not of men who have whooped them up and tried to enforce them. The truly civilized man is always skeptical and tolerant, in this field as in all others. His culture is based on "I am not too sure.”
― H.L. Mencken

“Two things are infinite: the universe and human stupidity; and I'm not sure about the universe.”
― Albert Einstein

“A woman's guess is much more accurate than a man's certainty.”
― Rudyard Kipling, Plain Tales from the Hills

“The most important thing we learn at school is the fact that the most important things can't be learned at school.”
― Haruki Murakami, What I Talk About When I Talk About Running