Tens of thousands of persons have given time and intelligence to arguments over these questions, and have devised nearly as many answers. After all this while, men have not reached any generally accepted conclusions, and there is no indication that we have advanced in these matters a single step beyond the reasonings of the ancient Greeks and Romans. This fact, and the contrast it presents to the advances made in solving the problems of the physical sciences, are enough to show that the attempted answers to these questions are not scientifically credible theories, but non-logical expressions,
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