In the Œdipus complex, the libido is attached to the image of the parents. But earlier there has been a period in which there were no such objects. There followed from this fact the concept (of fundamental importance for the libido theory) of a state in which the subject’s libido fills his own ego and has that for its object. This state could be called _narcissism_ or self-love. A moment’s reflection showed that this state never completely ceases. All through the subject’s life his ego remains the great reservoir of his libido, from which the attachments to objects (the _objectcathexes_[17]) radiate out and into which the libido can stream back again from the objects. Thus narcissistic libido is constantly being converted into object-libido, and _vice versa_. An excellent instance of the length to which this conversion can go is afforded by the sexual or sublimated devotion which involves a sacrifice of the self. Whereas, hitherto, in considering the process of repression, attention had only been paid to what was repressed, these ideas made it also possible to form a correct estimate of the repressing forces. It had been said that repression was set in action by the instincts of self-preservation operating in the ego (the “ego-instincts”), and that it was brought to bear upon the libidinal instincts. But since the instincts of self-preservation were now recognized as also being of a libidinal nature, as being narcissistic libido, the process of repression was seen to be a process occurring within the libido itself; narcissistic libido was opposed to object-libido, the interests of self-preservation defended themselves against the demands of object-love, that is, against the demands of sexuality in the narrower sense. There is no more urgent need in psychology than for a securely founded theory of the instincts on which it might then be possible to build further. Nothing of the sort exists, however, and psychoanalysis is driven to making tentative efforts towards some such theory. It began by drawing a contrast between the ego-instincts (the instinct of self-preservation, hunger) and the libidinal instincts (love), but later replaced it by a new contrast between narcissistic and object-libido. This was clearly not the last word on the subject; biological considerations seemed to make it impossible to remain content with assuming the existence of only a single class of instincts.