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Hitherto philosophers have had no occasion to concern themselves with a psychology of repression. We may therefore be permitted to make a first approach to this hitherto unknown topic by constructing a pictorial image of the course of events in dream-formation. It is true that the schematic picture we have arrived at - not only from the study of dreams - is a fairly complicated one; but we cannot manage with anything simpler. Our hypothesis is that in our mental apparatus there are two thought-constructing agencies, of which the second enjoys the privilege of having free access to consciousness for its products whereas the activity of the first is in itself unconscious and can only reach consciousness by way of the second. On the frontier between the two agencies, where the first passes over to the second, there is a censorship, which only allows what is agreeable to it to pass through and holds back everything else. According to our definition, then, what is rejected by the censorship is in a state of repression. Under certain conditions, of which the state of sleep is one, the relation between the strength of the two agencies is modified in such a way that what is repressed can no longer be held back. In the state of sleep this probably occurs owing to a relaxation of the censorship; when this happens it becomes possible for what has hitherto been repressed to make a path for itself to consciousness. Since, however, the censorship is never completely eliminated but merely reduced, the repressed material must submit to certain alterations which mitigate its offensive features. What becomes conscious in such cases is a compromise between the intentions of one agency and the demands of the other. Repression - relaxation of the censorship - the formation of a compromise, this is the fundamental pattern for the generation not only of dreams but of many other psychopathological structures; and in the latter cases too we may observe that the formation of compromises is accompanied by processes of condensation and displacement and by the employment of superficial associations, which we have become familiar with in the dream-work.