The good Lord set definite limits on man's wisdom, but set no limits on his stupidity - and that's just not fair!
Konrad Andenauer
The difference between genius and stupidity is that genius has it limits.
Anonymous
Life's tough. It's tougher if you're stupid.
John Wayne
A child of five would understand this. Send someone to fetch a child of five.
Groucho Marx
There is no sin except stupidity.
Oscar Wilde
Education costs money, but then so does ignorance.
Claus Moser
There is nothing more frightening than ignorance in action.
Goethe
A word to the wise ain't necessary - it's the stupid ones that need the advice.
Bill Cosby
Better silent than stupid.
German Proverb
When a true genius appears in this world, you will know him by the sign that all the dunces are in confederation against him.
Jonathan Swift
There's a fine line between fishing and just standing on the shore like an idiot.
Steven Wright
If you ask me anything I don't know, I'm not going to answer.
Yogi Berra
Never attribute to malice what can be adequately explained by stupidity.
Nick Diamos
If you think education is expensive - try ignorance.
Derek Bok
It is worse still to be ignorant of your ignorance.
Jerome
It is said that power corrupts, but actually, it's more true that power attracts the corruptible. The sane are usually attracted by other things than power.
David Brin
When Columbus started out he didn't know where he was going, when he got there he didn't know where he was, and when he got back, he didn't know where he had been.
Anonymous
Force always attracts men of low morality; and I believe it to be an invariable rule that tyrants of genius are succeeded by scoundrels.
Albert Einstein
Fanaticism consists in redoubling your effort when you have forgotten your sin.
George Santayana
Ignorance is the mother of admiration.
George Chapman
He that voluntarily continues in ignorance is guilty of all crimes which ignorance produces.
Samuel Johnson
It is so stupid of modem civilization to have given up belief in the devil when he is the only explanation of it.
Ronald Arbuthnott Knox
The only fool bigger than the person who knows it all is the person who argues with him.
Stanislaw Jerszy Lec
He can compress the most words into the smallest idea of any man I know.
Abraham Lincoln
A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools.
Douglas Adams
The Lord gave us two ends - one to sit on and the other to think with. Success depends on which one we use the most.
Ann Landers
In the face of an obstacle, which is impossible to overcome, stubbornness is stupid.
Simone de Beauvoir
Never underestimate the power of human stupidity.
Robert Heinlein
If poverty is the mother of crime, stupidity is its father.
Jean de La Bruyere
Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.
Albert Einstein
It is one of the blessings of old friends that you can afford to be stupid with them.
Ralph Waldo Emerson
Bonus!
The name Narcissus, found in Romans 16:11, means "stupidity." Narcissus was a person living in first century Rome who may have been a Christian. The Apostle Paul acknowledged his household in his letter to Rome.