Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. Albert Einstein

Only the wisest and stupidest of men never change. Confucius

When a stupid man is doing something he is ashamed of, he always declares that it is his duty. George Bernard Shaw

The problem with educating stupid people was that they didn't know they were stupid. The same went for curing crazy people. Chuck Palahniuk

Stupid people will mistake your confidence for arrogance. Habeeb Akande

The problem with the world is that everyone does not have a brain, but everyone does have a tongue. Raheel Farooq

Talk sense to a fool and he calls you foolish. Euripides

A brainiac notices everything, an ignoramus comments about everything. Heinrich Heine

Never argue with stupid people, they will drag you down to their level and then beat you with experience. Mark Twain

Genius may have its limitations, but stupidity is not thus handicapped. Elbert Hubbard

Get all the fools on your side and you can be elected to anything. Frank Dane

He is not only dull himself, but the cause of dulness in others. Samuel Johnson

The biggest cause of trouble in the world today is that the stupid people are so sure about things and the intelligent folks are so full of doubts. Bertrand Russell

Stupid people always think they are right. Wise people listen to advice. Proverb

Better to remain silent and be thought a fool than to speak and to remove all doubt. Abraham Lincoln

Showing off is the fool's idea of glory. Bruce Lee

The real war is not between the West and the East. The real war is between intelligent and stupid people. Marjane Satrapi

If you think your boss is stupid, remember: you wouldn't have a job if he was any smarter. John Gotti

It is so pleasant to come across people more stupid than ourselves. We love them at once for being so. Jerome K. Jerome

Stupid people do make me lose my temper and most people are stupid, fortunately for me. It's made it easier for me to make a living. Albert Gubay

Most people would sooner die than start to think. In fact - they do so. Bertrand Russell

Unintelligent people always look for a scapegoat. Ernest Bevin

It costs to be stupid. The stupider you are, the more it costs. Sherrill Brown

An empty head is not really empty; it is stuffed with rubbish. Hence the difficulty of forcing anything into an empty head. Eric Hoffer

I just hate stupid people. They should have to wear signs that say 'I'm Stupid.' That way you wouldn't rely on them, and you wouldn't ask them for nothing. Bill Engvall

Although it is not true that all conservatives are stupid people, it is true that most stupid people are conservative. John Stuart Mill

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? Scott Adams

An instructed and intelligent people are always more decent and orderly than an ignorant and stupid one. Adam Smith

Only stupid people don't change their minds. Boutros Boutros-Ghali

Wise men create proverbs and fools repeat them. Samuel Palmer