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

Of the two other kinds of healing which are spiritual-- that is to say, where the means of cure is a spiritual power-- one results from the entire concentration of the mind of a strong person upon a sick person, when the latter expects with all his concentrated faith that a cure will be effected from the spiritual power of the strong person, to such an extent that there will be a cordial connection between the strong person and the invalid. The strong person makes every effort to cure the sick patient, and the sick patient is then sure of receiving a cure. From the effect of these mental impressions an excitement of the nerves is produced, and this impression and this excitement of the nerves will become the cause of the recovery of the sick person. So when a sick person has a strong desire and intense hope for something and hears suddenly the tidings of its realization, a nervous excitement is produced which will make the malady entirely disappear. In the same way, if a cause of terror suddenly occurs, perhaps an excitement may be produced in the nerves of a strong person which will immediately cause a malady. The cause of the sickness will be no material thing, for that person has not eaten anything, and nothing harmful has touched him; the excitement of the nerves is then the only cause of the illness. In the same way the sudden realization of a chief desire will give such joy that the nerves will be excited by it, and this excitement may produce health (255:1)

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