The argument from biology and evolution is basic and has to be taken seriously; I don’t see how it can be left out of any discussion. Animals in order to survive have had to be protected by fear-responses, in relation not only to other animals but to nature itself. They had to see the real relationship of their limited powers to the dangerous world in which they were immersed. Reality and fear go together naturally. As the human infant is in an even more exposed and helpless situation, it is foolish to assume that the fear response of animals would have disappeared in such a weak and highly sensitive species. It is more reasonable to think that it was instead heightened, as some of the early Darwinians thought: early men who were most afraid were those who were most realistic about their situation in nature, and they passed on to their offspring a realism that had a high survival value. The result was the emergence of man as we know him: a hyperanxious animal who constantly invents reasons for anxiety even where there are none.