A man who does not know what has been thought by those who have gone before him is sure to set an undue value upon his own ideas—ideas which have perhaps been tried and found wanting. As accumulated learning stifles the mental powers, so original thinking has been known to bring about a puffy, unsubstantial mental condition.

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