In “Who’s in Charge Here? The Illusions of Church Infallibility” Dr. Michael Horton writes:

In my experience with those who wrestle with conversion to Roman Catholicism—at least those who have professed faith in the gospel, the driving theological issue is authority. How can I be certain that what I believe is true? The gospel of free grace through the justification of sinners in Christ alone moves to the back seat. Instead of the horse, it becomes the cart. Adjustments are made in their understanding of the gospel after accepting Rome’s arguments against sola scriptura. I address these remarks to friends struggling with that issue.

Reformation Christians can agree with Augustine when he said that he would never have known the truth of God’s Word apart from the catholic church. As the minister of salvation, the church is the context and means through which we come to faith and are kept in the faith to the end. When Philip found an Ethiopian treasury secretary returning from Jerusalem reading Isaiah 53, he inquired, “Do you understand what you are reading?” “How can I,” the official replied, “unless someone guides me?” (Ac 8:30-31). Explaining the passage in the light of its fulfillment in Christ, Philip baptized the man who then “went on his way rejoicing” (v 39).

Philip did not have to be infallible; he only had to communicate with sufficient truth and clarity the infallible Word.

For many, this kind of certainty, based on a text, is not adequate. We have to know—really know—that what we believe is an infallible interpretation of an ultimate authority. The churches of the Reformation confess that even though some passages are more difficult to understand, the basic narratives, doctrines and commands of Scripture—especially the message of Christ as that unfolds from Genesis to Revelation—is so clearly evident that even the unlearned can grasp it.

For the Reformers, sola scriptura did not mean that the church and its official summaries of Scripture (creeds, confessions, catechisms, and decisions in wider assemblies) had no authority. Rather, it meant that their ministerial authority was dependent entirely on the magisterial authority of Scripture. Scripture is the master; the church is the minister.

The following theses summarize some of the issues that people should wrestle with before embracing a Roman Catholic perspective on authority.

1. The Reformers did not separate sola scriptura (by Scripture alone) from solo Christo (Christ alone), sola gratia (by grace alone), sola fide (through faith alone). As Herman Bavinck said, “Faith in Scripture rises or falls with faith in Christ.” Revealed from heaven, the gospel message itself (Christ as the central content of Scripture) is as much the basis for the Bible’s authority as the fact that it comes from the Father through the inspiration of the Spirit. Jesus Christ, raised on the third day, certified his divine authority. Furthermore, he credited the Old Testament writings as “scripture,” equating the words of the prophets with the very word of God himself and commissioned his apostles to speak authoritatively in his name. Their words are his words; those who receive them also receive the Son and the Father. So Scripture is the authoritative Word of God because it comes from the unerring Father, concerning the Son, in the power of the Spirit. Neither the authority of the Bible nor that of the church can stand apart from the truth of Christ as he is clothed in his gospel.
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