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