The work refers to the general topic of the traumatic effects of transference in the analytic situation. The author defines the fundamental dilemma of interpretive technique as the technical difficulty, sometimes insurmountable, faced by the therapist in the treatment of severely ill patients, particularly in the case of narcissistic, self-centred disorders, where the interpretive action itself often produces negative side effects that are not countered by the curative effect of the insight achieved through interpretation. In a brief theoretical introduction, this dilemma is described as a longstanding problem in psychoanalysis that has been systematically concealed by the protracted discussion on the subject of 'analysability' and which has still not been resolved by the theory of technique. Clinical case material on a perverse patient is then presented to illustrate the dilemma described and to demonstrate some general strategies by which it may be overcome.