Abraham Lincoln (attributed):

'Tis better to be silent and be thought a fool, than to speak and remove all doubt.

Albert Einstein:

Great ideas often receive violent opposition from mediocre minds.

Albert Einstein:

Two things are infinite: the universe and human stupidity; and I'm not sure about the universe.

Aldous Huxley:

At least two thirds of our miseries spring from human stupidity, human malice and those great motivators and justifiers of malice and stupidity, idealism, dogmatism and proselytizing zeal on behalf of religious or political idols.

Aldous Huxley:

At least two thirds of our miseries spring from human stupidity, human malice and those great motivators and justifiers of malice and stupidity, idealism, dogmatism and proselytizing zeal on behalf of religious or political idols.

Bertrand Russell:

Most people would die sooner than think; in fact, they do.

Bill Cosby:

A word to the wise ain't necessary, it's the stupid ones who need the advice.

Edwin Land:

Creativity is the sudden cessation of stupidity.

Elbert Hubbard:

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

Friedrich von Schiller:

With stupidity the gods themselves contend in vain.

Isaac Asimov:

[W]hen people thought the Earth was flat, they were wrong. When people thought the Earth was spherical they were wrong. But if you think that thinking the Earth is spherical is just as wrong as thinking the Earth is flat, then your view is wronger than both of them put together.

John Stuart Mill:

Conservatives are not necessarily stupid, but most stupid people are conservatives.

Malcolm Forbes:

The dumbest people I know are those who know it all.

Mark Twain:

First, God created idiots. That was just for practice. Then He created school boards.

P. J. O'Rourke:

Then there's politics. Just imagine politics with its dumbbell element subtracted. There would be no Republican candidates. There would be no Democratic voters. The whole system would collapse.

Ralph Waldo Emerson:

It is one of the blessings of old friends that you can afford to be stupid with them.

Sam Levenson:

It's so simple to be wise. Just think of something stupid to say and say the opposite.

Tom DeLay:

Guns have little or nothing to do with juvenile violence. The causes of youth violence are working parents who put their kids into daycare, the teaching of evolution in the schools, and working mothers who take birth control pills. [on causes of the Columbine High School massacre, 1999]

Will Rogers:

If stupidity got us into this mess, then why can't it get us out?