Evangelicals maintain that God dictated the words of Scripture." By this, Lea & Griffen were referring to the entirety of the Scriptures, i.e. every single word in the Bible. Lea & Griffen meant that they advocated verbal plenary inspiration as fact, instead of the verbal dictation theory. The Evangelical position was criticized as being circular by an anonymous Catholic author, who accepted the doctrine of biblical inspiration. This author claimed that the Bible can only be used to prove doctrines of biblical inspiration if the doctrine is assumed to begin with. Some defenders of the evangelical doctrine such as B. B. Warfield and Charles Hodge, however, moved away from a circular argument and "committed themselves to the legitimacy of external verification" to inductively prove the doctrine, though they placed some restrictions on the evidences that could be considered. Lutheran and Reformed viewpoint As Lutherans confess in the Nicene Creed, the Holy Spirit "spoke through the prophets". The Apology of the Augsburg Confession identifies Holy Scripture with the Word of God and calls the Holy Spirit the author of the Bible. According to Frederic Farrar, Martin Luther did not understand inspiration to mean that the scriptures were dictated in a purely mechanical manner. Instead, Luther "held that they were not dictated by the Holy Spirit, but that His illumination produced in the minds of their writers the knowledge of salvation, so that divine truth had been expressed in human form, and the knowledge of God had become a personal possession of man. The actual writing was a human not a supernatural act." John Calvin also rejected the verbal dictation theory. Luther asserted that "He [the pious Christian] should not doubt that however simple they [the Scriptures] may seem, these are the very words, deeds, judgments, and history of the high majesty and wisdom of God; for this is the Scripture which makes fools out of all the wise". The doctrine of sola scriptura was one of the central teachings during the Protestant Reformation. It teaches that the Bible is the final authority for moral, spiritual, and for some, civil matters. As Luther said, "The true rule is this: God's Word shall establish articles of faith, and no one else, not even an angel can do so." Catholic viewpoint The Catechism of the Catholic Church alleges that the Bible's human writers were "consigned to writing whatever he wanted written, and no more."