Think of how stupid the average person is, and realize half of them are stupider than that.George Carlin
At least two-thirds of our miseries spring from human stupidity, human malice and those great motivators and justifiers of malice and stupidity: idealism, dogmatism and proselytizing zeal on behalf of religous or political ideas.Aldous Huxley
Stupidity is knowing the truth, seeing the truth but still believing the lies. And that is more infectious than any other disease.Richard Feynman
Nothing in all the world is more dangerous than sincere ignorance and conscientious stupidity.Martin Luther King, Jr.
To be stupid, selfish, and have good health are three requirements for happiness, though if stupidity is lacking, all is lost.Gustave Flaubert
Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.Albert Einstein
Two things are infinite: the universe and human stupidity; and I'm not sure about the universe.Albert Einstein