He may look like an idiot and talk like an idiot but don't let that fool you. He really is an idiot.

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

A man who prides himself on going in a straight line through life is an idiot who believes in infallibility.

A man is responsible for his ignorance.

A person who doesn't learn from the past is an idiot, in my estimation.

He's just a big stupid man to you, but I tell you there's more good in him than in may other people.

if a man is an honest idiot. i can love him. but i cannot love a dishonest genius

A man must be both stupid and uncharitable who believes there is no virtue or truth but on his own side.

Stupid men are the only ones worth knowing after all.

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

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

"You're an idiot."
"I've never claimed to be otherwise."

Sometimes a man wants to be stupid if it lets him do a thing his cleverness forbids.