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

Nothing is as dangerous as an ignorant friend; a wise enemy is to be preferred.

They say a little knowledge is a dangerous thing, but it's not one half so bad as a lot of ignorance.

Entire ignorance is not so terrible or extreme an evil, and is far from being the greatest of all; too much cleverness and too much learning, accompanied with ill bringing-up, are far more fatal.

True, a little learning is a dangerous thing, but it still beats total ignorance.

Not ignorance, but ignorance of ignorance, is the death of knowledge.

Ignorance is a menace to peace.

Ignorance is never better than knowledge.