It is evident that, if the body and mind are to maintain good health, the laws that govern physical existence cannot be ignored.
(Universal House of Justice, to a number of individual Bahá’ís resident in Europe, 19 April 2013)
It is possible for a man to hold to a book of medicine and say, “I have no need of a doctor; I will act according to the book; in it every disease is named, all symptoms are explained, the diagnosis of each ailment is completely written out, and a prescription for each malady is furnished; therefore, why do I need a doctor?” This is sheer ignorance. A physician is needed to prescribe. Through his skill the principles of the book are correctly and effectively applied until the patient is restored to health.
(‘Abdu’l-Bahá, The Promulgation of Universal Peace, p. 247)