Only two things are infinite, the universe and human stupidity, and I'm not sure about the universe.
The most violent element in society is ignorance.
It is impossible to defeat an ignorant man in argument.
William G. McAdoo
The trouble with the world is that the stupid are cocksure and the intelligent are full of doubt.
Light travels faster than sound. That's why most people seem bright until you hear them speak.
To be ignorant of one's ignorance is the malady of ignorance.
Everybody is ignorant, only on different subjects.
Before we work on artificial intelligence why don't we do something about natural stupidity?
A great deal of intelligence can be invested in ignorance.
A person is never happy except at the price of some ignorance.
Ignorance never settles a question.
I have never met a man so ignorant that I couldn't learn something from him.
The living man who does not learn, is dark, dark, like one walking in the night.
Ming Lum Paou Keen
There is no darkness but ignorance.
Nothing in all the world is more dangerous than sincere ignorance and conscientious stupidity.
Martin Luther King
If you think education is expensive, try ignorance.
Ignorance gives one a large range of probabilities.
Stupidity is something unshakable; nothing attacks it without breaking itself against it; it is of the nature of granite, hard and resistant.
Have the courage to be ignorant of a great number of things, in order to avoid the calamity of being ignorant of everything.
The recipe for perpetual ignorance is: Be satisfied with your opinions and content with your knowledge.
Some folks are wise and some are otherwise.
Ignorance and inconsideration are the two great causes of the ruin of mankind.
We are all born ignorant, but one must work hard to remain stupid.
Silence is not always sign of wisdom, but babbling is ever a mark of folly.
If you think knowledge is dangerous, try ignorance.
There are many things of which a wise man might wish to be ignorant.
Ralph Waldo Emerson
Against logic there is no armor like ignorance.
Laurence J. Peter
The greater the ignorance the greater the dogmatism.
Sir William Osler
Ignorance is bliss.
I know nothing except the fact of my ignorance.