The most difficult subjects can be explained to the most slow-witted man if he has not formed any idea of them already; but the simplest thing cannot be made clear to the most intelligent man if he is firmly persuaded that he knows already, without a shadow of doubt, what is laid before him.

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Quote text and notes from Wikiquote: Leo Tolstoy (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.