"Johann Joseph Gassner (22 August 1727 in Braz, near Bludenz, Vorarlberg – 1779 Pondorf, now part of Winklarn, Bavaria) was a noted exorcist.
While a Catholic ...
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priest at Klösterle he gained a wide celebrity by professing to "cast out devils" and to work cures on the sick by means simply of prayer; he was attacked as an impostor, but the bishop of Regensburg, who believed in his honesty, bestowed upon him the cure of Pondorf.
Gassner´s methods have been linked to a special form of hypnotic training. He has been described as a predecessor of modern hypnosis. Henri Ellenberger, in his "Discovery of the Unconscious", placed the dispute between Gassner and Franz Anton Mesmer at the center of modern psychotherapy." - (en.wikipedia.org 19.02.2020)
