If the book is of the sort that conveys knowledge, the author’s aim was to instruct. He has tried to teach. He has tried to convince or persuade his reader about something. His effort is crowned with success only if the reader finally says, “I am taught. You have convinced me that such and such is true, or persuaded me that it is probable.” But even if the reader is not convinced or persuaded, the author’s intention and effort should be respected. The reader owes him a considered judgment. If he cannot say, “I agree,” he should at least have grounds for disagreeing or even for suspending
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