Melanchthon’s vacillation was the inevitable consequence of a false doctrinal standpoint. According to the principles of Luther and Melanchthon, faith, even as a mere assurance of salvation, should of itself avail to save a man and therefore to make him a member of the Church. Thus there is no longer any ground to require a preliminary belief or obedient acceptance of the whole substance of the Word of God; and yet some acceptance, at least implicit, of the whole substance of revelation, seems required of everyone who desires to be a Christian. This explains the efforts of both Luther and Melanchthon to discover ways and means for the reintroduction of this sort of faith. Their search was rendered the more difficult by the fact that here there was a “work” in the most real sense of the word, viz. willing, humble and cheerful acceptance of the law, and readiness to accord a firm assent to the truths revealed. The difficulty was even enhanced because in the last resort an authority is required, particularly by the unlearned, to formulate the doctrines and to point out what the true content of revelation is. In point of fact, however, every external guarantee of this sort had been discarded, at least theoretically, and no human authority could provide such an assurance. We seek in vain for a properly established authority capable of enacting with binding power what has to be believed, now that Luther and Melanchthon have rejected the idea of a visible Church and hierarchy, vicariously representing Christ. From this point of view it is easy to understand Melanchthon’s efforts—illogical though they were—to erect an edifice of “pure doctrine for all time” and his fondness for a “firm, hard and rigid law of doctrine.” His perplexity and wavering were only too natural. What reliable guarantee was Melanchthon in a position to offer—he who so frequently altered his teaching—that his own interpretation of Scripture exactly rendered the Divine Revelation, and thus constituted “pure doctrine” firm and unassailable? Modern theologians, when they find fault with Melanchthon for his assumption of authority and for his alteration of Luther’s teaching, have certainly some justification for their strictures.[1166]