In the foregoing exposition we have now learnt something of the dream work; we must regard it as a quite special psychical process, which, so far as we are aware, resembles nothing else. To the dream work has been transferred that bewilderment which its product, the dream, has aroused in us. In truth, the dream work is only the first recognition of a group of psychical processes to which must be referred the origin of hysterical symptoms, the ideas of morbid dread, obsession, and illusion. Condensation, and especially displacement, are never-failing features in these other processes. The regard for appearance remains, on the other hand, peculiar to the dream work. If this explanation brings the dream into line with the formation of psychical disease, it becomes the more important to fathom the essential conditions of processes like dream building. It will be probably a surprise to hear that neither the state of sleep nor illness is among the indispensable conditions. A whole number of phenomena of the everyday life of healthy persons, forgetfulness, slips in speaking and in holding things, together with a certain class of mistakes, are due to a psychical mechanism analogous to that of the dream and the other members of this group.
Displacement is the core of the problem, and the most striking of all the dream performances. A thorough investigation of the subject shows that the essential condition of displacement is purely psychological; it is in the nature of a motive. We get on the track by thrashing out experiences which one cannot avoid in the analysis of dreams. I had to break off the relations of my dream thoughts in the analysis of my dream on p. 8 because I found some experiences which I do not wish strangers to know, and which I could not relate without serious damage to important considerations. I added, it would be no use were I to select another instead of that particular dream; in every dream where the content is obscure or intricate, I should hit upon dream thoughts which call for secrecy. If, however, I continue the analysis for myself, without regard to those others, for whom, indeed, so personal an event as my dream cannot matter, I arrive finally at ideas which surprise me, which I have not known to be mine, which not only appear foreign to me, but which are unpleasant, and which I would like to oppose vehemently, whilst the chain of ideas running through the analysis intrudes upon me inexorably. I can only take these circumstances into account by admitting that these thoughts are actually part of my psychical life, possessing a certain psychical intensity or energy. However, by virtue of a particular psychological condition, the thoughts could not become conscious to me. I call this particular condition “Repression.” It is therefore impossible for me not to recognize some casual relationship between the obscurity of the dream content and this state of repression—this incapacity of consciousness. Whence I conclude that the cause of the obscurity is the desire to conceal these thoughts. Thus I arrive at the conception of the dream distortion as the deed of the dream work, and of displacement serving to disguise this object.