Indeed the argument which we are considering, seems to us to be founded on an entire mistake. There are branches of knowledge with respect to which the law of the human mind is progress. In mathematics, when once a proposition has been demonstrated, it is never afterwards contested. Every fresh story is as solid a basis for a new superstructure as the original foundation was. Here, therefore, there is a constant addition to the stock of truth. In the inductive sciences again, the law is progress. Every day furnishes new facts, and thus brings theory nearer and nearer to perfection. There is no chance that, either in the purely demonstrative, or in the purely experimental sciences, the world will ever go back or even remain stationary. Nobody ever heard of a reaction against Taylor’s theorem, or of a reaction against Harvey’s doctrine of the circulation of the blood. But with theology the case is very different. As respects natural religion,--revelation being for the present altogether left out of the question,--it is not easy to see that a philosopher of the present day is more favourably situated than Thales or Simonides. He has before him just the same evidences of design in the structure of the universe which the early Greeks had. We say just the same; for the discoveries of modern astronomers and anatomists have really added nothing to the force of that argument which a reflecting mind finds in every beast, bird, insect, fish, leaf, flower and shell. The reasoning by which Socrates, in Xenophon’s hearing, confuted the little atheist Aristodemus, is exactly the reasoning of Paley’s Natural Theology. Socrates makes precisely the same use of the statues of Polycletus and the pictures of Zeuxis which Paley makes of the watch. As to the other great question, the question, what becomes of man after death, we do not see that a highly educated European, left to his unassisted reason, is more likely to be in the right than a Blackfoot Indian. Not a single one of the many sciences in which we surpass the Blackfoot Indians throws the smallest light on the state of the soul after the animal life is extinct. In truth all the philosophers, ancient and modern, who have attempted, without the help of revelation to prove the immortality of man, from Plato down to Franklin, appear to us to have failed deplorably.