But that is not all. Thanks to a second discovery of Breuer's, for which he alone deserves credit and which appears to me to be even more far-reaching, we are able to learn still more concerning the relationship between the unconscious and the neurotic symptom. Not alone is the meaning of the symptoms invariably hidden in the unconscious; but the very existence of the symptom is conditioned by its relation to this unconscious. You will soon understand me. With Breuer I maintain the following: Every time we hit upon a symptom we may conclude that the patient cherishes definite unconscious experiences which withhold the meaning of the symptoms. Vice versa, in order that the symptoms may come into being, it is also essential that this meaning be unconscious. Symptoms are not built up out of conscious experiences; as soon as the unconscious processes in question become conscious, the symptom disappears. You will at once recognize here the approach to our therapy, a way to make symptoms disappear. It was by these means that Breuer actually achieved the recovery of his patient, that is, freed her of her symptoms; he found a technique for bringing into her consciousness the unconscious experiences that carried the meaning of her symptoms, and the symptoms disappeared. This discovery of Breuer's was not the result of a speculation, but of a felicitous observation made possible by the coöperation of the patient. You should therefore not trouble yourself to find things you already know to which you can compare these occurrences, rather you should recognize herein a new fundamental fact which in itself is capable of much wider application. Toward this further end permit me to go over this ground again in a different way. The symptom develops as a substitution for something else that has remained suppressed. Certain psychological experiences should normally have become so far elaborated that consciousness would have attained knowledge of them. This did not take place, however, but out of these interrupted and disturbed processes, imprisoned in the unconscious, the symptom arose. That is to say, something in the nature of an interchange had been effected; as often as therapeutic measures are successful in again reversing this transposition, psychoanalytic therapy solves the problem of the neurotic symptom. Accordingly, Breuer's discovery still remains the foundation of psychoanalytic therapy. The assertion that the symptoms disappear when one has made their unconscious connections conscious, has been borne out by all subsequent research, although the most extraordinary and unexpected complications have been met with in its practical execution. Our therapy does its work by means of changing the unconscious into the conscious, and is effective only in so far as it has the opportunity of bringing about this transformation.