When can an opinion be relied on?

There is the greatest difference between presuming an opinion to be true, because, with every opportunity for con­testing it, it has not been refuted, and assuming its truth for the purpose of not permitting its refutation. Complete liberty of contradicting and disproving our opinion, is the very condition which justifies us in assuming its truth for purposes of action; and on no other terms can a being with human faculties have any rational assurance of being right. [ch. II, 26]

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