For it can always be argued that these norms would not be in force if they did not express some traits of human nature. In this way, spiritual naturalism can, in practical problems, become one with positivism, in spite of their traditional opposition. In fact, this form of naturalism is so wide and so vague that it may be used to defend anything. There is nothing that has ever occurred to man which could not be claimed to be ‘natural’; for if it were not in his nature, how could it have occurred to him?
