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

The existence of the world may be compared to that of a man, and the Prophets and Messengers of God to skillful doctors. The human being cannot remain in one condition: different maladies occur which have each a special remedy. The skillful physician does not give the same medicine to cure each disease and each malady, but he changes remedies and medicines according to the different necessities of the diseases and constitutions. One person may have a severe illness caused by fever, and the skilled doctor will give him cooling remedies; and when at some other time the condition of this person has changed, and fever is replaced by chills, without doubt the skilled doctor will discard cooling medicine and permit the use of heating drugs. This change and alteration is required by the condition of the patient and is an evident proof of the skill of the physician (94:3)

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