Since the breach with the Viennese school upon the question of the fundamental explanatory principle of analysis—that is, the question if it be sexuality or energy—our concepts have undergone considerable development. After the prejudice concerning the explanatory basis had been removed by the acceptance of a purely abstract view of it, the nature of which was not anticipated, interest was directed to the concept of the unconscious. According to Freud's theory the contents of the unconscious are limited to infantile wish-tendencies, which are repressed on account of the incompatibility of their character. Repression is a process which begins in early childhood under the moral influence of environment; it continues throughout life. These repressions are done away with by means of analysis, and the repressed wishes are made conscious. That should theoretically empty the unconscious, and, so to say, do away with it; but in reality the production of infantile sexual wish-fantasies continues into old age. According to this theory, the unconscious contains only those parts of the personality which might just as well be conscious, and have really only been repressed by the processes of civilisation. According to Freud the essential content of the unconscious would therefore be personal. But although, from such a view-point the infantile tendencies of the unconscious are the more prominent, it would be a mistake to[446] estimate or define the unconscious from this alone, for it has another side. Not only must the repressed materials be included in the periphery of the unconscious, but also all the psychic material that does not reach the threshold of consciousness. It is impossible to explain all these materials by the principle of repression, for in that case by the removal of the repression a phenomenal memory would be acquired, one that never forgets anything. As a matter of fact repression exists, but it is a special phenomenon. If a so-called bad memory were only the consequence of repression, then those persons who have an excellent memory should have no repression, that is, be incapable of being neurotic. But experience teaches us that this is not the case. There are, undoubtedly, cases with abnormally bad memories, where it is clear that the main cause must be attributed to repression. But such cases are comparatively rare. We therefore emphatically say that the unconscious contains all that part of the psyche that is found under the threshold, including subliminal sense-perceptions, in addition to the repressed material. We also know—not only on account of accumulated experience, but also for theoretical reasons—that the unconscious must contain all the material that has not yet reached the level of consciousness. These are the germs of future conscious contents. We have also every reason to suppose that the unconscious is far from being quiescent, in the sense that it is inactive, but that it is probably constantly busied with the formation and re-formation of so-called unconscious phantasies. Only in pathological cases should this activity be thought of as comparatively autonomous, for normally it is co-ordinated with consciousness.