Knowledge of the universe is not to be obtained by metaphysics.
Most philosophers – or, at any rate, very many – profess to be able to prove, by a priori metaphysical reasoning, such things as the fundamental dogmas of religion, the essential rationality of the universe, the illusoriness of matter, the unreality of all evil, and so on. There can be no doubt that the hope of finding reason to believe such theses as these has been the chief inspiration of many life-long students of philosophy. This hope, I believe, is vain. It would seem that knowledge concerning the universe as a whole is not to be obtained by metaphysics, and that the proposed proofs that, in virtue of the laws of logic such-and-such things must exist and such-and-such others cannot, are not capable of surviving a critical scrutiny.
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