Some Ans. Questions 1908 by -'Abdu'l-Bahá- 1 Para

To conclude, the complete and perfect connection between the spiritual doctor and the sick person-- that is, a connection of such a kind that the spiritual doctor entirely concentrates himself, and all the attention of the sick person is given to the spiritual doctor from whom he expects to realize health-- causes an excitement of the nerves, and health is produced. But all this has effect only to a certain extent, and that not always. For if someone is afflicted with a very violent disease, or is wounded, these means will not remove the disease nor close and heal the wound-- that is to say, these means have no power in severe maladies, unless the constitution helps, because a strong constitution often overcomes disease. This is the third kind of healing (255:2)

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