If you then proceed to the verification of the older sources, you will consider the same data, the possible motives of the writers and the consistency of the various parts of the evidence. The result of the examination will surely be convincing in the case of Alexander. It will probably turn out differently when applied to individuals like Moses and Nimrod. But what doubts you might raise against the credibility of the psychoanalytic reporter you will see plainly enough upon a later occasion. At this point you have a right to raise the question, "If there is no such thing as objective verification of psychoanalysis, and no possibility of demonstrating it, how can one possibly learn psychoanalysis and convince himself of the truth of its claims?" The fact is, the study is not easy and there are not many persons who have learned psychoanalysis thoroughly; but nevertheless, there is a feasible way. Psychoanalysis is learned, first of all, from a study of one's self, through the study of one's own personality. This is not quite what is ordinarily called self-observation, but, at a pinch, one can sum it up thus. There is a whole series of very common and universally known psychic phenomena, which, after some instruction in the technique of psychoanalysis, one can make the subject matter of analysis in one's self. By so doing one obtains the desired conviction of the reality of the occurrences which psychoanalysis describes and of the correctness of its fundamental conception. To be sure, there are definite limits imposed on progress by this method. One gets much further if one allows himself to be analyzed by a competent analyst, observes the effect of the analysis on his own ego, and at the same time makes use of the opportunity to become familiar with the finer details of the technique of procedure. This excellent method is, of course, only practicable for one person, never for an entire class.