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There was never a genius without a tincture of insanity. Aristotle

What a distressing contrast there is between the radiant intelligence of the child and the feeble mentality of the average adult. Sigmund Freud

In view of the fact that God limited the intelligence of man, it seems unfair that he did not also limit his stupidity. Dean Acheson

The only good is knowledge and the only evil is ignorance. Socrates

I know nothing except the fact of my ignorance. Socrates