After studying the classics at Princeton, I trained in psychiatry at Yale and in psychoanalysis at Columbia. That background is why a Catholic priest had asked my professional opinion ... about whether [a self-styled Satanic high priestess] was suffering from a mental disorder. My subject's behavior exceeded what I could explain with my training. She knew how individuals she'd never known had died, including my mother and her fatal case of ovarian cancer. Six people later vouched to me that, during her exorcisms, they heard her speaking multiple languages, including Latin, completely unfamiliar to her outside of her trances. This was not psychosis; it was what I can only describe as paranormal ability. I concluded that she was possessed. Much later, she permitted me to tell her story. For the past two-and-a-half decades and over several hundred consultations, I've helped clergy from multiple denominations and faiths to filter episodes of mental illness - which represent the overwhelming majority of cases - from, literally, the devil's work. Questions about how a scientifically trained physician can believe such outdated and unscientific nonsense," as I've been asked, have a simple answer. I honestly weigh the evidence. Those who dismiss these cases unwittingly prevent patients from receiving the help they desperately require, either by failing to recommend them for psychiatric treatment (which most clearly need) or by not informing their ... ministers that something beyond a mental or other illness seems to be the issue.