To understand the case, we have to admit a great mobility of the sexual components, which even goes so far that one of the components can practically disappear completely, whilst the other comes to the front. If only substitution took place, if for instance the homo-sexual component entered the unconscious, leaving the field of consciousness to the hetero-sexual component, modern scientific knowledge would lead us to conclude that equivalent effects arose from the unconscious sphere. Those effects would have to be conceived as resistances against the activity of the hetero-sexual component, as a repugnance towards women.
Experience tells us nothing about this. There have been some small traces of influences of this kind, but of such slight intensity that they cannot be compared with the intensity of the former homo-sexual component. On the conception that has been outlined, it is also incomprehensible how this homo-sexual component, regarded as so firmly fixed, can ever disappear without leaving active traces. To explain things, the process of development is called in, forgetting that this is only a word and explains nothing. You see, therefore, the urgent necessity of an adequate explanation of such a change of scene. For this we must have a dynamic hypothesis. Such commutations are only conceivable as dynamic or energic processes. I cannot conceive how manifestations of functions can disappear if I do not accept a change in the relation of one force to another. Freud's theory did have regard to this necessity in the conception of components. The presumption of isolated functions existing side by side began to be somewhat weakened, more in practice than theoretically. It was replaced by an energic conception. The term chosen for this conception is "libido."
