Only, the way I figure, no man has the right to be ignorant. In a country like this, ignorance is a crime. If a man is going to vote, if he’s going to take part in his country and its government, then it’s up to him to understand.

He who knows not and knows not that he knows not is an incorrigible fool.

An ignorant person is inclined to blame others for his own misfortune. To blame oneself is proof of progress. But the wise man never has to blame another or himself.

A man who does not think for himself does not think at all.

Ignorance, when voluntary, is criminal, and a man may be properly charged with that evil which he neglected or refused to learn how to prevent.

The most hopelessly stupid man is he who is not aware he is wise.

Any man can make mistakes, but only an idiot persists in his error

His ignorance is encyclopedic.

It is worse still to be ignorant of your ignorance.

The ignorant man is an ox. He grows in size, not in wisdom.

It is ignorance that causes most mistakes.

He was distinguished for ignorance; for he had only one idea, and that was wrong.

What a man does not know is greater than he.

The idiot is indeed the good man, but only because he doesn't know any better.