'Exorcism can be said to be the prototype of modern psychotherapy. Psychotherapy, like exorcism, commonly consists of a prolonged, pitched, demanding, soul-wrenching, sometimes tedious bitter battle royale with the patient's diabolically obdurate emotional "demons," at times waged over the course of years or even decades rather than weeks or months, and not necessarily always with consummate success. And there is now growing recognition--not only by psychoanalytic practitioners--of the very real risks and dangers of psychic infection inherent also in the practice of psychotherapy. (This psychic susceptibility is almost universally depicted in these films, starting with The Exorcist and most recently by The Devil Inside.) Counter-transference is what we clinicians technically call this treacherous psychological phenomenon, which can cause the psychotherapist (or exorcist) to suffer disturbing, subjective symptoms during the treatment process – sometimes even as the patient progresses!... - Adam Crowe