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stupidity

Albert Einstein
Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.
Frank Zappa
There is more stupidity than hydrogen in the universe, and it has a longer shelf life.
Friedrich von Schiller
Against stupidity, the gods themselves contend in vain.
Martin Luther King Jr.
Nothing in the world is more dangerous than sincere ignorance and conscientious stupidity.