Never underestimate the power of stupid people in large groups.
I am patient with stupidity but not with those who are proud of it.
It’s too bad that stupidity isn’t painful.
Talk sense to a fool and he calls you foolish.
The trouble with the world is that the stupid are cocksure and the intelligent are full of doubt.
Only the wisest and stupidest of men never change.
Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.
When a stupid man is doing something he is ashamed of, he always declares that it is his duty.
Egotism is the anesthetic that dulls the pain of stupidity.
It is dangerous to be sincere unless you are also stupid.
To be stupid, selfish, and have good health are three requirements for happiness, though if stupidity is lacking, all is lost.
Whenever a man does a thoroughly stupid thing, it is always from the noblest motives.
There is more stupidity than hydrogen in the universe, and it has a longer shelf life.
There is nothing worse than aggressive stupidity.
If Stupidity got us into this mess, then why can't it get us out?
Genius may have its limitations, but stupidity is not thus handicapped.
Nothing in the world is more dangerous than sincere ignorance and conscientious stupidity.
The two most common elements in the universe are hydrogen and stupidity.
If there are no stupid questions, then what kind of questions do stupid people ask? Do they get smart just in time to ask questions?
There are only two races on this planet - the intelligent and the stupid.
I couldn't repair your brakes, so I made your horn louder.
Ordinarily he was insane, but he had lucid moments when he was merely stupid
Stupidity is the deliberate cultivation of ignorance.
There are more fools in the world than there are people.
The bookful blockhead, ignorantly read With loads of learned lumber in his head.
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