"Sanctions and negotiations can be very ineffective, and indeed foolish, unless the people you are talking with and negotiating with and trying to reach agreements with are people who can be trusted to keep their word."

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Such evidence is not the only kind which produces belief; though positivism maintains that it is the only kind which ought to produce so high a degree of confidence as all minds have or can be made to have through their agreements.

— Chauncey Wright