In contrast to this, regression of libido in compulsion-neurosis turns back most conspicuously to the earlier sadistico-anal organization, which accordingly becomes the most significant factor expressed by the symptoms. Under these conditions the love impulse must mask itself as a sadistic impulse. The compulsion idea must therefore be reinterpreted. Isolated from other superimposed factors, which though they are not accidental are also indispensable, it no longer reads: "I want to murder you"; rather it says "I want to enjoy you in love." Add to this, that simultaneously regression of the object has also set in, so that this impulse is invariably directed toward the nearest and dearest persons, and you can imagine with what horror the patient thinks of these compulsion ideas and how alien they appear to his conscious perception. In the mechanism of these neuroses, suppression, too, assumes an important part, which it is not easy to explain in a superficial discussion of this sort. Regression of the libido without suppression would never result in neurosis but would finally end in perversion. This makes it obvious that suppression is the process most characteristic of neurosis, and typifies it most perfectly. Perhaps I shall at some future time have the opportunity of presenting to you our knowledge of the mechanism of perversions and then you will see that here also things do not work themselves out as simply as we should best like to construe them. You will most readily reconcile yourself with these elucidations of fixation and regression, when you consider them as a preface to the investigation of the etiology of neuroses. Towards this I have only advanced a single fact: that people become neurotically ill when the possibility of satisfying their libido is removed, ill with "denial," as I expressed myself, and that their symptoms are the substitutes for the denied gratification. Of course, that does not mean that every denial of libidinous satisfaction makes every person neurotic, but merely that in all cases known of neurosis, the factor of denial was traceable. The syllogism therefore cannot be reversed. You also understand, I trust, that this statement is not supposed to reveal the entire secret of the etiology of neurosis, but only emphasizes an important and indispensable condition.