The only thing essential to the dream itself is the dream-work which has operated upon the thought-material; and when we come to theory we have no right to disregard this, even if in certain practical situations it may be neglected. Further, analytic observation shows that the dream-work never consists merely in translating the latent thoughts into the archaic or regressive forms of expression described. On the contrary, something is invariably added which does not belong to the latent thoughts of the day-time, but which is the actual motive force in dream-formation; this indispensable component being the equally unconscious _wish_, to fulfil which the content of the dream is transformed. In so far, then, as you are considering only the thoughts represented in it, the dream may be any conceivable thing—a warning, a resolve, a preparation, and so on; but besides this, it itself is always the fulfilment of an unconscious wish, and, when you regard it as the result of the dream-work, it is this alone. A dream then is never simply the expression of a resolve or warning, and nothing more: in it the resolve, or whatever it may be, is translated into the archaic form with the assistance of an unconscious wish, and metamorphosed in such a way as to be a fulfilment of that wish. This single characteristic, that of fulfilling a wish, is the constant one: the other component varies; it may indeed itself be a wish; in which event the dream represents the fulfilment of a latent wish from our waking hours brought about by the aid of an unconscious wish. Now all this is quite clear to myself, but I do not know whether I have succeeded in making it equally clear to you; and it is difficult to prove it to you; for, on the one hand, proof requires the evidence afforded by a careful analysis of many dreams and, on the other hand, this, the crucial and most important point in our conception of dreams, cannot be presented convincingly without reference to considerations upon which we have not yet touched. Seeing how closely linked up all phenomena are, you can hardly imagine that we can penetrate very far into the nature of any one of them without troubling ourselves about others of a similar nature. Since as yet we know nothing about those phenomena which are so nearly akin to dreams—neurotic symptoms—we must once more content ourselves with what we actually have achieved. I will merely give you the explanation of one more example and adduce a new consideration.