📖 Biblical Definition
The sufficiency of Scripture is the doctrine that the Bible contains all the words of God necessary for salvation, for faith, and for obedience, so that nothing further—no new revelation, no tradition, no private inspiration—need be added for the church to know God’s will and be thoroughly furnished for every good work. Paul tells Timothy that the holy Scriptures are able to make him wise unto salvation through faith in Christ, and that the God-breathed Scripture is profitable to make the man of God perfect, thoroughly furnished unto all good works—a completeness that leaves nothing essential lacking. The Westminster Confession states it precisely: 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 it; unto which nothing at any time is to be added, whether by new revelations of the Spirit or traditions of men. The doctrine does not claim that the Bible answers every question men might ask—it is not a manual of medicine, agriculture, or engineering—but that it is wholly sufficient for the ends for which God gave it: to reveal Himself, His Christ, and the way of salvation, and to govern faith and life. Sufficiency thus guards the church against two robbers: those who would supplement Scripture with the authority of tradition, and those who would supplant it with claims of fresh revelation.
📜 Webster 1828 Definition
Webster 1828 defines SUFFICIENCY as adequate substance or means, the quality of being equal to the end proposed; applied to Scripture, its adequacy for faith and salvation.
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SUFFICIENCY, n. — 1. The state of being adequate to the end proposed. 2. Qualification for any purpose. 3. Competence; adequate substance or means.
SUFFICIENT, a. — Equal to the end proposed; adequate to wants; enough; competent. Applied to Scripture, containing all things necessary to salvation.
📖 Key Scripture
2 Timothy 3:15 — "And that from a child thou hast known the holy scriptures, which are able to make thee wise unto salvation through faith which is in Christ Jesus."
2 Timothy 3:16-17 — "All scripture is given by inspiration of God, and is profitable... That the man of God may be perfect, throughly furnished unto all good works."
Deuteronomy 4:2 — "Ye shall not add unto the word which I command you, neither shall ye diminish ought from it."
Revelation 22:18-19 — "...If any man shall add unto these things, God shall add unto him the plagues that are written in this book."
⚠️ Modern Corruption
Sufficiency is denied from two sides: by Rome and others who add the authority of tradition alongside Scripture, and by charismatic movements that supplement or supplant it with claims of ongoing revelation—“God told me.”
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The sufficiency of Scripture is assaulted by two opposite parties who agree in this—that the Bible alone is not enough. The first is the appeal to tradition, classically the Roman position, which sets unwritten apostolic tradition and the teaching of the magisterium alongside Scripture as a second stream of authority, so that the church may bind the conscience to doctrines (purgatory, the Marian dogmas, papal supremacy) that Scripture neither teaches nor warrants. This robs Scripture of its sufficiency by making it incomplete—a partial deposit needing the church’s additions to be whole.
The second party is the claim of continuing revelation, common in charismatic and revivalist circles, where the “word of the Lord” spoken by a prophet, the impression felt in prayer, or the confident “God told me” is treated as fresh divine speech that supplements—and often effectively supplants—the written Word. This too denies sufficiency, implying that the closed canon left the church wanting and that God must keep speaking new directives. Against both, the doctrine confesses that Scripture is complete and final: nothing is to be added, whether by traditions of men or new revelations of the Spirit. The God who has spoken by His Son in these last days has spoken fully; the church’s task is not to await more words but to obey the words she has.
🔗 Greek & Hebrew Roots
The doctrine rests on Scripture making the man of God artios (complete, fitted) and exartizō (thoroughly furnished) for every good work, with the standing prohibition not to add.
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Usage
"The sufficiency of Scripture means the Bible contains all things necessary for salvation, faith, and life—nothing to be added."
"Rome denies sufficiency by adding tradition; charismatics deny it by adding fresh revelation."
"‘God told me’ sets a private word beside the closed canon, quietly denying Scripture’s sufficiency."