Being deeply knowledgeable on one subject narrows one's focus and increases confidence, but it also blurs dissenting views until they are no longer visible, thereby transforming data collection into bias confirmation and morphing self-deception into self-assurance.

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