Ladies and gentlemen, this is far from being all that might be said about errors. There is indeed much left to investigate and to discuss. But I am satisfied if, from our investigations to date, your previous views are somewhat shaken and if you have acquired a certain degree of liberality in the acceptance of new ones. For the rest, I must content myself with leaving you face to face with an unclear condition of affairs. We cannot prove all our axioms by the study of errors and, indeed, are by no means solely dependent on this material. The great value of errors for our purpose lies in the fact that they are very frequent phenomena that can easily be observed on oneself and the occurrence of which do not require a pathological condition. I should like to mention just one more of your unanswered questions before concluding: "If, as we have seen in many examples, people come so close to understanding errors and so often act as though they penetrated their meaning, how is it possible that they can so generally consider them accidental, senseless and meaningless, and can so energetically oppose their psychoanalytic elucidation?" You are right; that is conspicuous and demands an explanation. I shall not give this explanation to you, however, but shall guide you slowly to the connecting links from which the explanation will force itself upon you without any aid from me. II THE DREAM FIFTH LECTURE THE DREAM _Difficulties and Preliminary Approach_ One day the discovery was made that the disease symptoms of certain nervous patients have a meaning.[22] Thereupon the psychoanalytic method of therapy was founded. In this treatment it happened that the patients also presented dreams in place of their symptoms. Herewith originated the conjecture that these dreams also have a meaning. We will not, however, pursue this historical path, but enter upon the opposite one. We wish to discover the meaning of dreams as preparation for the study of the neuroses. This inversion is justified, for the study of dreams is not only the best preparation for that of the neuroses, but the dream itself is also a neurotic symptom, and in fact one which possesses for us the incalculable advantage of occurring in all normals. Indeed, if all human beings were well and would dream, we could gain from their dreams almost all the insight to which the study of the neuroses has led.