“A third consideration which presents itself, in regard to the views developed here, starts the query as to whether we should accept as sufficiently effectual the universal receding of the libido from the outer world, in order to interpret from that, the end of the world: or whether in this case, the firmly rooted possession of the ‘I’ must not suffice to uphold the rapport with the outer world. Then one must either let that which we call possession of the libido (interest from erotic sources) coincide with interest in general, or else take into consideration the possibility that great disturbance in the disposition of the libido can also induce a corresponding disturbance in the possession of the ‘I.’ Now, these are the problems, which we are still absolutely helpless and unfitted to answer. Things would be different could we proceed from a safe fund of knowledge of instinct. But the truth is, we have nothing of that kind at our disposal. We understand instinct as the resultant of the reaction of the somatic and the psychic. We see in it the psychical representation of organic forces and take the popular distinction between the ‘I’ impulse and the sexual impulse, which appears to us to be in accord with the biological double rôle of the individual being who aspires to his own preservation as well as to the preservation of the species. But anything beyond this is a structure, which we set up, and also willingly let fall again in order to orient ourselves in the confusion of the dark processes of the soul; we expect particularly, from the psychoanalytic investigations into diseased soul processes, to have certain decisions forced upon us in regard to questions of the theory of instinct. This expectation has not yet been fulfilled on account of the still immature and limited investigations in these fields. At present the possibility of the reaction of libido disturbance upon the possession of the ‘I’ can be shown as little as the reverse; the secondary or induced disturbances of the libido processes through abnormal changes in the ‘I.’ It is probable that processes of this sort form the distinctive character of the psychoses. The conclusions arising from this, in relation to paranoia, are at present uncertain. One cannot assert that the paranoiac has completely withdrawn his interest from the outer world, nor withdrawn into the heights of repression, as one sometimes sees in certain other forms of hallucinatory psychoses. He takes notice of the outer world, he takes account of its changes, he is stirred to explanations by their influence, and therefore I consider it highly probable that the changed relation to the world is to be explained, wholly or in great part, by the deficiency of the libido interest.”