Quotes on Stupidity

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I don't know what makes you so dumb, but it works!
Never attribute to malice what can be adequately explained by stupidity. 
The only difference between genius and stupidity is that genius has its limits.
We always underestimate the ingenuity of idiots.
Better to remain silent and be thought a fool, than to speak and remove all doubt.
With stupidity and sound digestion man may front much.
The trouble with the world is that the stupid are cocksure and the intelligent are full of doubt.
It seems to me certain that more people are killed out of righteous stupidity than out of wickedness.
A stupid man's report of what a clever man says can never be accurate, because he unconsciously translates what he hears into something he can understand.
Gli idioti sono una saggia istituzione della natura che permette agli stupidi di ritenersi intelligenti.
It's easier to fool people than to convince them that they have been fooled.
I'm not a complete idiot, some parts are missing.
Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.
Never argue with idiots... They bring you down to their level and beat you with experience.
There is a limit to human intelligence, but there is no limit to human stupidity
IDIOT: A member of a large and powerful tribe whose influence in human affairs has always been dominant and controlling.