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