If we were conscious of the spirit of the age, we should know why we are so inclined to account for everything on physical grounds; we should know that it is because, up till now, too much was accounted for in terms of the spirit. This realization would at once make us critical of our bias. We should say: most likely we are now making as serious an error on the other side. We delude ourselves with the thought that we know much more about matter than about a "metaphysical" mind, and so we overestimate physical causation and believe that it alone affords us a true explanation of life. But matter
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