If you judge a fish by its ability to climb a tree, it will live its whole life believing that it is stupid.
Never underestimate the power of stupid people in large groups.
Talk sense to a fool and he calls you foolish.
If a cluttered desk is a sign of a cluttered mind, of what, then, is an empty desk a sign?
Men are born ignorant, not stupid. They are made stupid by education.
People demand freedom of speech as a compensation for the freedom of thought which they seldom use.
Two things are infinite: the universe and human stupidity; and I'm not sure about the universe.
All the history of human life has been a struggle between wisdom and stupidity.