"If all mankind minus one were of one opinion, mankind would be no more justified in silencing that one person than he, if he had the power, would be justified in silencing mankind."
"... All ideas need to be heard, because each idea contains one aspect of the truth. By examining that aspect, we add to our own idea of the truth. Even ideas that have no truth in them whatsoever are useful because by disproving them, we add support to our own ideas."
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Source: John Stuart Mill, Harriet Taylor Mill (1970). “Essays on Sex Equality”, p.238, University of Chicago Press
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