The most useful analogy here is that of Reason—by which I do not mean some separate faculty but, once more, the whole man judging, only judging this time not about good and evil, but about truth and falsehood. Now any concrete train of reasoning involves three elements: Firstly, there is the reception of facts to reason about. These facts are received either from our own senses, or from the report of other minds; that is, either experience or authority supplies us with our material. But each man’s experience is so limited that the second source is the more usual; of every hundred facts upon
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