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

Now we will speak of material healing. The science of medicine is still in its infancy and has not yet reached maturity. But when it reaches that stage, treatments will be administered with things that are not repulsive to the senses of taste and smell, that is, through foods, fruits, and plants that have an agreeable taste and a pleasant smell. For the cause of the intrusion of illness into the human body is either a physical agent or a nervous excitement and stimulation (73:2)

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