"Psychoanalysis, in my opinion, is incapable of creating a weltanschauung of its own. It does not need one; it is a part of science and can adhere to the scientific weltanschauung. This, however, scarcely deserves such a grandiloquent title, for it is not all-comprehensive, it is too incomplete and makes no claim to being self-contained and to the construction of systems. Scientific thought is still very young among human beings; there are too many of the great problems which it has not yet been able to solve. A weltanschauung erected upon science has, apart from its emphasis on the real external world, mainly negative traits, such as submission to the truth and rejection of illusions."

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