The example of the practices of three eighteenth and nineteenth century physicians, the author points out the importance of the profile of healers whose role (suggestion) in the healing process was more effective than their controversial methods. The following represents the impact mechanisms of suggestion (placebo effect) on the amazing healing phenomenon, indicating the possibility of the fatal consequences of suggestion in the context of (black) magic (nocebo effect), corroborating the facts stated. It warns of the frequent confusion of the fields of psychology and religion (the resuscitation of Mesalianism, the ancient misconception of confusing authentic spiritual experiences with psychological states), which has become the dominant feature of New Age self-help literature and psychology. It concludes with Christian miracle theology and features of Christian prayer for healing, suggesting guidelines useful for the pastoral and therapeutic work that has been derived from this research.