In these selected texts, spanning from 1905 to 1938 and remaining untranslated until today, the major Freudian principle of mental conflict is revealed through the investigation of various forms of psychopathology, as well as the behavior of the individual's ego in relation to the demands of impulses and external reality. The individual, with a nature and position that is perverse/narcissistic, will come into conflict with current reality (the pleasure principle in contrast to the reality principle) in his attempt to integrate into the external world. In this effort, resorting to neurosis or psychosis signifies a pathological way of adaptation. The major element that psychoanalysis brings, regarding the structure and function of the psyche, is that the psyche is not a unified and solid entity, but is composed of mnemonic traces, representations, and fantasies, primarily in an unconscious form. This needs to be brought to light and managed by an individual's ego, after first managing to become aware of it, in order to reduce the chances of becoming ill. This poses the significant challenge that psychoanalysis sets forth, both as analysis and as therapy, through the process of revealing the unconscious process.