(3) Psychological or spiritual naturalism is in a way a combination of the two previous views, and it can best be explained by means of an argument against the one-sidedness of these views. The ethical positivist is right, this argument runs, if he emphasizes that all norms are conventional, i.e. a product of man, and of human society; but he overlooks the fact that they are therefore an expression of the psychological or spiritual nature of man, and of the nature of human society. The biological naturalist is right in assuming that there are certain natural aims or ends, from which we can
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