Nothing is less probable than that the father really did this. It is only a phantasy, probably first constructed in the course of the analysis from that same need of discovering a cause which once induced the physician to form the theory that hysteria was only caused by such impressions. This case seemed to me suitable to demonstrate the meaning of the theory of regression, and to show at the same time the source of the theoretical mistakes so far. We saw that both sisters were originally only slightly different. From the moment of the engagement their ways were totally separated. They seemed now to have quite different characters. The one, vigorous in health, and enjoying life, was a good and courageous woman, willing to undertake the natural demands of life; the other was sad, ill-tempered, full of bitterness and malice, disinclined to make any effort towards a reasonable life, egotistical, quibbling, and a nuisance to all about her. This striking difference was only brought out when the one sister happily passed through the difficulties of her engagement, whilst the other did not. For both, it hung to a certain extent only on a hair, whether the affair would be broken off or not. The younger one, somewhat calmer, was therefore more deliberate, and able to find the right word at the right moment. The elder one was more spoiled and more sensitive, consequently more influenced by her emotions, and could not find the right word, nor had she the courage to sacrifice her pride to put things straight afterwards. This little circumstance had a very important effect. Originally the conditions were much the same for both sisters. The greater sensitiveness of the elder produced the difference. The question now is: Whence arose this sensitiveness with its unfortunate results? The analysis demonstrated the existence of an extraordinarily developed sexuality of infantile phantastic character; in addition, an incestuous phantasy towards the father. We have a quick and easy solution of the problem of this sensitiveness, if we admit that these phantasies had a lively, and therefore effective existence. We might thus readily understand why this girl was so sensitive. She was shut up in her own phantasies and strongly attached to her father. Under these circumstances, it would have been really a wonder had she been willing to love and marry another man. The more we pursue our need for a causation, and pursue the development of these phantasies back to their beginning, the greater grow the difficulties of the analysis, that is to say, the resistances as we call them. At the end we should find that impressive scene, that obscene act, whose improbability has already been established. This scene has exactly the character of a subsequent phantastic formation. Therefore, we have to conceive these difficulties, which we called “resistances,” at least in this part of the analysis, as an opposition of the patient against the formation of such phantasies,