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Shiavault - a Vault of Shia Islamic Books The Conception of the Sahaba's Ultimate Decency and the Political Authority in Islam Chapter 3 — the Competent Practitioner of Nominating the Authority As we have previously mentioned, it is necessary that each doctrine has a legitimate authority being coherent and perfecting that doctrine. It is unrealizable to find a divine doctrine without an authority in charge of explicating it.
Indispensably, this authority must be the most knowledgeable, familiar and sincere to the doctrine. In the same manner, the authority must be the most favorable and the fittest for the position. These qualifications should be realized by conviction and certitude, apart from conjecture and surmise. These matters, in fact, can be comprehended by Allah exclusively considering Him as the Knowing of the hiddens as well as the appearances.
This is the base on which God is the only One Who is in charge of selecting and nominating the authority. This is an indisputable truth.
The Divine Custody declared availability of these qualifications in the prophets whom were elected by God alone all over the mankind history, disregarding any objection such like those who said: (Why was not this Quran revealed to a man of importance in the two towns?) or those who objected and described the prophet as (This fellow, who is contemptible, and who can hardly speak distinctly.) Since such a sort of objection is originated from conjecture and surmise, while the divine selection of prophets is arisen from conviction and absolute certitude of their being the most knowledgeable, familiar, sincere, favorable, honorable and fittest for explicating the divine doctrine and leading the ship and the followers of Islam, these objections were neglected.
Briefly, Allah, the Exalted, is the only Competent to decide the authorities whose mission is conveying the divine doctrine all over the mankind history. He, exclusively, does realize the most eligible for conveying such beliefs. It has never happened that God left choice for people in the matter of electing the prophets.
Missions and Functions of the Authority Nominated By God It is an indisputable that the entire honorable prophets are authorities assigned by Allah Who informed us of this election. We are, here, to show the missions and functions those authorities were to practice.