[Sándor Ferenczi's theoretical achievement].

The Hungarian Sándor Ferenczi has not only been a very close friend of Sigmund Freud and an outstanding representative of the psychoanalytic movement, but also an excellent man of early "Tiefenpsychologie". In the most valuable part of his research - the investigation of the sense of reality - he made a step into future tendencies of psychoanalysis, the ego-psychoanalysis. He was able to modify the analytic technique, a fact which in those days caused quite a bit of criticism by the psychoanalytic movement and by Freud himself too.