This question requireth the most careful investigation. The Báb hath said that the people of Bahá must develop the science of medicine to such a high degree that they will heal illnesses by means of foods. The basic reason for this is that if, in some component substance of the human body, an imbalance should occur, altering its correct, relative proportion to the whole, this fact will inevitably result in the onset of disease. If, for example, the starch component should be unduly augmented, or the sugar component decreased, an illness will take control. It is the function of a skilled physician to determine which constituent of his patient’s body hath suffered diminution, which hath been augmented. Once he hath discovered this, he must prescribe a food containing the diminished element in considerable amounts, to re-establish the body’s essential equilibrium. The patient, once his constitution is again in balance, will be rid of his disease. The proof of this is that while other animals have never studied medical science, nor carried on researches into diseases or medicines, treatments or cures—even so, when one of them falleth a prey to sickness, nature leadeth it, in fields or desert places, to the very plant which, once eaten, will rid the animal of its disease. The explanation is that if, as an example, the sugar component in the animal’s body hath decreased, according to a natural law the animal hankereth after a herb that is rich in sugar. Then, by a natural urge, which is the appetite, among a thousand different varieties of plants across the field, the animal will discover and consume that herb which containeth a sugar component in large amounts. Thus the essential balance of the substances composing its body is re-established, and the animal is rid of its disease. This question requireth the most careful investigation. When highly-skilled physicians shall fully examine this matter, thoroughly and perseveringly, it will be clearly seen that the incursion of disease is due to a disturbance in the relative amounts of the body’s component substances, and that treatment consisteth in adjusting these relative amounts, and that this can be apprehended and made possible by means of foods.