A man says, “I see that the two calculations ˇso far agree but I don't know why they should go on agreeing”. In Shall we say that he doesn't see a truth which the other sees? – He tries always again & again. We ask him: “But don't you see that you must get to the same result again?
  Should we say that he must make go the long way of experience, where we go the shorter one of seeing?

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