Having established the Holy Scripture as the necessary, inspired, and self-authenticating Word of God, the Westminster divines proceed to answer a series of practical and vital questions. If the Bible is God’s final written revelation, is it enough? Is it clear enough for the average person to understand? How can we trust our copies and translations? How do we properly interpret it? And what role does it play when disagreements arise? In these next five paragraphs, the Confession moves from the identity of Scripture to its qualities, laying out a robust doctrine of its sufficiency, clarity, preservation, interpretation, and ultimate supremacy as the judge of all truth. This is where the doctrine of Sola Scriptura is given its full and careful definition.
The Confession argues that the Holy Scripture is a complete and sufficient revelation containing all things necessary for salvation, possesses a foundational clarity in its essential doctrines, has been faithfully preserved and is to be translated for all people, and stands as the supreme and final judge in all religious controversies, with its ultimate interpretation guided by the Spirit through the comparison of its own texts.
The Sufficiency of Scripture (WCF 1.6)
The doctrine of the sufficiency of Scripture is the heart of the Protestant commitment to the Bible alone as our final authority. The divines articulate this principle with careful precision, stating that “The whole counsel of God concerning all things necessary for His own glory, man’s salvation, faith and life, is either expressly set down in Scripture, or by good and necessary consequence may be deduced from Scripture.” This is a profound statement. It means that for every matter essential to our faith, the Bible is all we need. As Paul tells Timothy, the Scriptures are “able to make you wise for salvation” and are profitable for teaching and training, equipping the man of God “for every good work” (2 Tim. 3:15–17).
To this sufficient counsel, “nothing at any time is to be added, whether by new revelations of the Spirit, or traditions of men.” This is a direct application of the severe apostolic warnings. To the Galatians who were tempted to add works to the gospel, Paul declares, “if we or an angel from heaven should preach to you a gospel contrary to the one we preached to you, let him be accursed” (Gal. 1:8). To the Thessalonians, he warns against being alarmed by a “spirit or a spoken word, or a letter” claiming to be from the apostles with a new revelation (2 Thess. 2:2). The canon is closed; the Word is complete.
Yet, the Confession wisely qualifies this. It acknowledges “the inward illumination of the Spirit of God to be necessary for the saving understanding of such things as are revealed in the Word.” The Word is sufficient in its content, but our hearts require the Spirit’s work to receive it rightly. As Paul writes, “no eye has seen, nor ear heard…what God has prepared for those who love him,” but “God has revealed to us through the Spirit” (1 Cor. 2:9–12). Furthermore, it states “that there are some circumstances concerning the worship of God, and government of the Church…which are to be ordered by the light of nature, and Christian prudence.” The Bible doesn’t specify a time for a church service, for instance. These are matters of wisdom, guided by the biblical principles of decency and order (1 Cor. 14:26, 40).
The Clarity of Scripture (WCF 1.7)
If the Bible is our only rule, it must be understandable. This is the doctrine of the clarity, or perspicuity, of Scripture. The Confession is pastorally realistic, admitting that “All things in Scripture are not alike plain in themselves, nor alike clear unto all.” The apostle Peter himself said that in Paul’s letters there “are some things in them that are hard to understand” (2 Peter 3:16).
But this is not the final word. The divines immediately give this crucial assurance: “yet those things which are necessary to be known, believed, and observed for salvation, are so clearly propounded, and opened in some place of Scripture or other, that not only the learned, but the unlearned, in a due use of the ordinary means, may attain unto a sufficient understanding of them.” The central message of the gospel is not hidden in esoteric codes. It is plain. The psalmist declares that God’s word is a “lamp to my feet and a light to my path” (Ps. 119:105) and that “The unfolding of your words gives light; it imparts understanding to the simple” (Ps. 119:130).
The Preservation and Translation of Scripture (WCF 1.8)
The divines next address the reliability of the text we hold in our hands. The Old and New Testaments in their original languages were “immediately inspired by God, and, by His singular care and providence, kept pure in all ages,” and are therefore “authentical.” God’s providential preservation ensures that not one “iota, not a dot, will pass from the Law until all is accomplished” (Matt. 5:18). Because of this, “in all controversies of religion, the Church is finally to appeal unto them.” This is precisely what the Scriptures themselves command: “To the law and to the testimony! If they do not speak according to this word, it is because they have no dawn” (Isa. 8:20).
However, because “these original tongues are not known to all the people of God,” the Scriptures “are to be translated into the vulgar language of every nation.” This is not merely a suggestion but a command, for the people are commanded “to read and search them” (John 5:39). How can they do so if the Word is locked away in a foreign tongue? Paul’s extended argument in 1 Corinthians 14 insists that for the church to be built up, the Word must be intelligible. An uninterpreted tongue is useless; likewise, an untranslated Bible cannot produce “patience and comfort of the Scriptures” so that we “may have hope” (Rom. 15:4), nor can it allow the Word of Christ to “dwell in you richly” (Col. 3:16).
The Interpretation of Scripture (WCF 1.9)
How, then, do we determine the true meaning of the Bible? The Confession provides a foundational Protestant principle: “The infallible rule of interpretation of Scripture is the Scripture itself.” This is sometimes called the analogy of faith. This means that when there is a question about the “true and full sense of any Scripture…it must be searched and known by other places that speak more clearly.” We do not need an external authority to tell us what the Bible means. Peter confirms this when he states that “no prophecy of Scripture comes from someone’s own interpretation” (2 Peter 1:20). It comes from God, and its meaning is unlocked by the whole of God’s counsel. The apostles model this at the Jerusalem Council, where they interpret the events of Gentile conversion by appealing to how “with this the words of the prophets agree” (Acts 15:15).
The Supreme Judge (WCF 1.10)
This entire chapter culminates in one final, glorious declaration. “The supreme judge by which all controversies of religion are to be determined…can be no other but the Holy Spirit speaking in the Scripture.” All other authorities—”decrees of councils, opinions of ancient writers, doctrines of men, and private spirits”—are subordinate and “are to be examined” by the Word of God. Our Lord Himself operated this way, rebuking the Sadducees, “You are wrong, because you know neither the Scriptures nor the power of God,” before appealing directly to the text: “have you not read what was said to you by God?” (Matt. 22:29, 31). The foundation of the church itself is “the apostles and prophets, Christ Jesus himself being the cornerstone” (Eph. 2:20). Our final appeal, as Paul’s was, is to what “The Holy Spirit was right in saying…through Isaiah the prophet” (Acts 28:25). The Spirit’s voice is heard infallibly in the pages of Holy Scripture.
Conclusion
With these paragraphs, the Westminster divines provide a full-orbed doctrine of Scripture for the life of the church. The Bible is not merely an important book; it is the sufficient book, containing all we need for faith and life. It is the clear book, its saving message accessible to all. It is the preserved book, faithfully kept by God and intended for all nations in their own tongue. It is the self-interpreting book, its own most reliable guide. And finally, it is the supreme book, the final judge and arbiter of all truth. This is the sure foundation upon which we can build our lives, our families, and our churches without fear.
Key Terms/Concepts
- Sufficiency of Scripture (Sola Scriptura): The doctrine that the Bible contains all the knowledge necessary for salvation and for Christian living. No other writings or revelations are needed, and nothing is to be added to or taken away from it.
- Clarity (Perspicuity) of Scripture: The doctrine that the central teachings of the Bible necessary for salvation are taught so clearly that they can be understood by anyone who, using ordinary means like prayerful and diligent reading, seeks to understand them.
- Good and Necessary Consequence: A principle of biblical interpretation stating that doctrines may be derived not only from what is explicitly stated in Scripture but also from what can be logically and necessarily inferred from the text.
- Analogy of Faith (Analogia Fidei): The principle that Scripture is its own best interpreter. Unclear or difficult passages should be understood in the light of clearer passages, and individual texts should be interpreted in harmony with the theological context of the Bible as a whole.
- Supreme Judge: The role of Scripture as the final and ultimate authority in all matters of religious controversy. The decrees of councils, the teachings of church fathers, and private revelations must all be tested against the final verdict of the “Holy Spirit speaking in the Scripture.”