You can't convince a believer of anything; for their belief is not based on evidence, it's based on a deep seated need to believe.

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Notes from Wikiquote

It appears attributed to Sagan in Judson Poling's 2003 book "Do Science and the Bible Conflict?" Via Google Books, but without source.

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Attribution

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