A thick head can do as much damage as a hard heart.

—H.W. Dodds

The highest form of ignorance is to reject something you don’t know anything about.

—Wayne Dyer

The whole problem with the world is that fools and fanatics are always so certain of themselves, and wiser people so full of doubts.    

—Bertrand Russell

The fool’s mind wanders, the wise mind wonders.

—Patrick J. Mills

The sage awakes to light in the night of all creatures. That which the world calls day is the night of ignorance to the wise.               

—Bhagavad-Gita

The opposite of love is not hate; the opposite of love is ignorance.        

 —Brian Hwang

I am patient with stupidity but not with those who are proud of it.                  

—Edith Sitwell

Nothing in the world is more dangerous than sincere ignorance and conscientious stupidity.

—Martin Luther King, Jr

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

—Frank Dane

There are more fools in the world than there are people.

 —Heinrich Heine

To succeed in the world, it is not enough to be stupid, you must also be well-mannered.

—Voltaire

Everybody is ignorant, only on different subjects.

 —Will Rogers

The reason there is so much ignorance is that those who have it are so eager to share it.                   

—Frank A. Clark

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

Ignorance is no excuse, it’s the real thing.            

 —Irene Peter

Three minutes of thought would suffice to find this out; but thought is irksome and three minutes is a long time.

—A.E. Houseman

A man profits more by the sight of an idiot than by the orations of the learned.

 —Arabian proverb

There are four causes of ignorance: faith in authority, the power of custom, illusions of sense, and the proud delusion of an imagined wisdom.

—Roger Bacon

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

 –Albert Einstein

I wash my hands of those who imaging chattering to be knowledge, silence to be ignorance, and affectation to be art.

–Kahlil Gibran