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“In these matters, which concern the external, spoken Word, we must hold firmly to the conviction that God gives no one his Spirit or grace except through or with the external Word which comes before. Thus we shall be protected from the enthusiasts — that is, from the spiritualists who boast that they possess the Spirit without and before the Word and who therefore judge, interpret, and twist the Scriptures or spoken Word according to their pleasure.”

The Book of Concord : The Confessions of the Evangelical Lutheran Church

The Holy Spirit establishes a wide difference among teachers and gives the right rule by which the spirits are to be tested. He wants to say that there are two kinds of teachers. There are some who speak on their own authority; that is, they evolve their message from their own reasoning or religious zeal and judgment. The Holy Spirit is not to be that kind of preacher; for He will not speak on His own authority… In this way Christ sets bounds for the message of the Holy Spirit Himself. He is not to preach anything new or anything else than Christ and His Word. Thus we have a sure guide and touchstone for judging the false spirits.”

Luther’s works, vol. 24 : Sermons on the Gospel of St. John: Chapters 14-16