First, a man of sense would have known that a single experiment is not sufficient to establish a general rule even in sciences much less complicated … - Thomas Babington Macaulay, 1st Baron Macaulay

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First, a man of sense would have known that a single experiment is not sufficient to establish a general rule even in sciences much less complicated than the science of government; that, since the beginning of the world, no two political experiments were ever made of which all the conditions were exactly alike; and that the only way to learn civil prudence from history is to examine and compare an immense number of cases.