Wundt[86] remarks that “among the influences which myth everywhere ascribes to demons the evil ones preponderate, so that according to the religions of races evil demons are evidently older than good demons.” Now it is quite possible that the whole conception of demons was derived from the extremely important relation to the dead. In the further course of human development the ambivalence inherent in this relation then manifested itself by allowing two altogether contrary psychic formations to issue from the same root, namely, the fear of demons and of _ghosts_, and the reverence for ancestors[87]. Nothing testifies so much to the influence of mourning on the origin of belief in demons as the fact that demons were always taken to be the spirits of persons not long dead. Mourning has a very distinct psychic task to perform, namely, to detach the memories and expectations of the survivors from the dead. When this work is accomplished the grief, and with it the remorse and reproach, lessens, and therefore also the fear of the demon. But the very spirits which at first were feared as demons now serve a friendlier purpose; they are revered as ancestors and appealed to for help in times of distress. If we survey the relation of survivors to the dead through the course of the ages, it is very evident that the ambivalent feeling has extraordinarily abated. We now find it easy to suppress whatever unconscious hostility towards the dead there may still exist without any special psychic effort on our part. Where formerly satisfied hate and painful tenderness struggled with each other, we now find piety, which appears like a cicatrice and demands: _De mortuis nil nisi_ _bene_. Only neurotics still blur the mourning for the loss of their dear ones with attacks of compulsive reproaches which psychoanalysis reveals as the old ambivalent emotional feeling. How this change was brought about, and to what extent constitutional changes and real improvement of familiar relations share in causing the abatement of the ambivalent feeling, need not be discussed here. But this example would lead us to assume _that the psychic impulses of primitive man possessed a higher degree of ambivalence than is found at present among civilized human beings. With the decline of this ambivalence the taboo, as the compromise symptom of the ambivalent conflict, also slowly disappeared._ Neurotics who are compelled to reproduce this conflict, together with the taboo resulting from it, may be said to have brought with them an atavistic remnant in the form of an archaic constitution the compensation of which in the interest of cultural demands entails the most prodigious psychic efforts on their part.