"A man can understand astronomy only by being an astronomer; he can understand entomology only by being an entomologist (or, perhaps, an insect); but he can understand a great deal of anthropology merely by being a man. He is himself the animal which he studies. Hence arises the fact which strikes the eye everywhere in the records of ethnology and folk-lore—the fact that the same frigid and detached spirit which leads to success in the study of astronomy or botany leads to disaster in the study of mythology or human origins. It is necessary to cease to be a man in order to do justice to a microbe; it is not necessary to cease to be a man in order to do justice to men. That same suppression of sympathies, that same waving away of intuitions or guess-work which make a man preternaturally clever in dealing with the stomach of a spider, will make him preternaturally stupid in dealing with the heart of man. He is making himself inhuman in order to understand humanity."