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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.

Nothing is more terrible than to see ignorance in action.

Ignorance of all things is an evil neither terrible nor excessive, nor yet the greatest of all; but great cleverness and much learning, if they be accompanied by a bad training, are a much greater misfortune.

Ignorance can be improved; willful ignorance and inaction is inexcusable.

I know of no time in human history where ignorance was better than knowledge.

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

Ignorance per se is not nearly as dangerous as ignorance of ignorance.

To know anything well involves a profound sensation of ignorance.

Ignorance is bold and knowledge reserved.