“It's too bad that stupidity isn't painful.”
Anton LaVey
“Two things are infinite: the universe and human stupidity; and I'm not sure about the the universe.”
Albert Einstein
“Whenever a man does a thoroughly stupid thing, it is always from the noblest motives.”
Oscar Wilde
“To forget one's purpose is the commonest form of stupidity.”
Friedrich Nietzsche
“The only way to comprehend what mathematicians mean by Infinity is to contemplate the extent of human stupidity.”
Voltaire
“There is no sin except stupidity.”
“It is dangerous to be sincere unless you are also stupid.”
George Bernard Shaw