The doctrine of inspiration — that Scripture is "God-breathed" (theopneustos) — is the foundation of all Christian theology. The Westminster Confession of Faith (WCF 1.2) declares that all sixty-six books of the Old and New Testaments are "given by inspiration of God to be the rule of faith and life." ^[raw/en/wcf-ch01-s02.md]
The key text is 2 Timothy 3:16: "All scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness." The Greek word theopneustos is unique to this verse — it means "breathed out by God." Scripture is not merely writings that God inspired human authors to produce; it is the very breath of God in written form.
B. B. Warfield, the Princeton theologian, argued that this word means more than that the writers were inspired in the sense of being elevated or enlightened. It means that the writings themselves are breathed out by God. The product is divine. Scripture is not merely a record of revelation; it is itself revelation — the very Word of God in written form.
2 Peter 1:20-21 gives the complementary truth: "No prophecy of the scripture is of any private interpretation. For the prophecy came not in old time by the will of man: but holy men of God spake as they were moved by the Holy Ghost." The Greek pheromenoi — "borne along" or "carried" — pictures the human authors carried by the Holy Spirit as a ship is carried by the wind.
The Westminster Confession affirms what Warfield called organic inspiration: the Holy Spirit worked through the personalities, styles, and circumstances of the human authors, not overriding them but superintending them. The result is a fully human and fully divine book — each word written by a human hand, yet each word breathed out by God.
The Confession lists all sixty-six books of the Old and New Testaments, affirming that these "are now contained" under the name of Holy Scripture. The word "now" is significant — it indicates that the canon grew over time but is now closed and complete. No new books can be added because no new revelation is being given.
The Westminster Divines rejected the Apocryphal books that the Council of Trent (1545-1563) had declared canonical. They followed the Hebrew canon, the witness of the Jewish church to whom "were committed the oracles of God" (Rom 3:2), and the practice of Christ and the apostles, who quoted the Old Testament hundreds of times but never once cited the Apocrypha as Scripture. ^[raw/en/wcf-ch01-s02.md]
Scripture is called the "rule of faith and life" (regula fidei et vitae) — meaning it is the final, supreme, and only infallible authority for everything Christians believe (faith) and everything they do (life). This is the Reformation principle of sola Scriptura.
John Calvin grounded the authority of Scripture not in the church's decree but in the testimonium internum Spiritus Sancti — the internal witness of the Holy Spirit. The same Spirit who inspired the Word must illuminate our hearts to receive it. We do not believe the Bible because arguments compel us; we believe it because the Spirit bears witness with our spirit that this book is from God.
The doctrine of inspiration is intimately connected to the attributes of God. The God who inspired Scripture is the God who is "infinite in being and perfection," "most holy," and "abundant in goodness and truth" (WCF 2.1). Because God is truth, His Word is truth (John 17:17). Because God is holy, His Word is pure (Ps 12:6). Because God is immutable, His Word stands forever (Isa 40:8).
The triune God is the author of Scripture: the Father speaks, the Son is the living Word (John 1:1), and the Spirit inspires the written Word (2 Pet 1:21).
The canon is closed, but the Spirit's work is not done. The Spirit's ministry today is not to give new revelation but to illuminate the revelation already given — to open blind eyes, soften hard hearts, and apply the written Word to the lives of believers. As the Confession says in its closing phrase, these inspired books alone constitute "the rule of faith and life."