"Never think that you already know all. However highly you are appraised, always have the courage to say to yourself-I am ignorant."
"If we could look through the skull into the brain of a consciously thinking person, and if the place of optimal excitability were luminous, then we should see playing over the cerebral surface, a bright spot with fantastic, waving borders constantly fluctuating in size and form, surrounded by a darkness more or less deep, covering the rest of the hemisphere."
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Source: Bequest to the Academic Youth of Soviet Russia, 1936.
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