Some Ans. Questions 2014 by -'Abdu'l-Bahá- 1 Para

In brief, a complete and perfect connection between the spiritual physician and the patient- that is, one where the physician concentrates his entire attention on the patient and where the patient likewise concentrates all his attention on the spiritual physician and anticipates healing- causes a nervous excitement whereby health is regained. But this is effective only to a point and not in all cases. For instance, should someone contract a grave illness or be physically injured, these means will neither dispel the illness nor soothe and heal the injury- that is, these means have no sway over grave illnesses unless assisted by the constitution of the patient, for a strong constitution will often ward off an illness. This is the third kind of healing (72:6)

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