Agreement is comparatively unimportant in the search for truth: we may easily both be mistaken. People did strongly agree, for a very long time, on many erroneous doctrines (such as the Ptolemaic system of the world); and agreement is often the result of the fear of intolerance, or even of violence.
Karl Popper, “Toleration and Intellectual Responsibility,” in Susan Mendus and David Edwards (editors), On Toleration, Clarendon Press, Oxford, 1987, pp. 17 – 34.
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