After The Worst Ennemies of Psychoanalysis and The Best Friends of Psychoanalysis Prado de Oliveira turns to the Hungarian psychoanalyst Sándor Ferenczi (1873-1933). Prado considers Ferenczi to be the most paradoxical disciple of Freud for being both close and critical, loyal and original (originality often being considered as a flaw in psychoanalytic institutions), methodical and ebullient. Not only in theory. Ferenczi is maybe best known for his experimental practice, described in his clinical diaries.