Sola scriptura (Latin: “by Scripture alone”) is a theological principle holding that the Bible is the sole infallible rule of faith and practice for Christians. Originating as a central slogan of the Protestant Reformation of the sixteenth century, it asserts that Scripture possesses supreme and self-sufficient authority in matters of Christian doctrine, ethics, and governance - without requiring validation by church tradition, councils, or papal decree. The principle is distinguished from related concepts such as prima scriptura (Scripture as primary but not exclusive authority) and the Catholic and Orthodox positions, which regard Scripture and authoritative tradition as jointly constitutive of Christian doctrine.

The formal articulation of sola scriptura is associated with Martin Luther, who appealed to Scripture as the final authority when called to recant at the Diet of Worms in 1521. Luther and other reformers - including Ulrich Zwingli and John Calvin - argued that the medieval church had accumulated doctrines and practices not grounded in, and in some cases contradicted by, biblical texts. The principle became one of the so-called “Five Solas” that summarized core Reformation commitments. Its implications shaped the structure of Protestant ecclesiology, hermeneutics, and the eventual fragmentation of Protestantism into diverse denominational traditions. The mainstream Reformers were not alone in appealing to Scripture against Rome; the Radical Reformation - associated with figures such as Conrad Grebel and Balthasar Hubmaier - pressed a more thoroughgoing rejection of tradition, a trajectory that would later develop into what critics distinguish as solo scriptura. For a fuller account, see Sola Scriptura - History.

The Roman Catholic Church responded to sola scriptura formally at the Council of Trent (1545-1563), affirming that divine revelation is transmitted through both Scripture and apostolic tradition, each interpreted authoritatively by the Church's magisterium. The Roman Inquisition served in part as an enforcement mechanism against views the Church judged heretical, including Protestant scriptural claims. Eastern Orthodox Christianity similarly rejects sola scriptura, though on grounds partly distinct from Roman Catholic objections.

Sola scriptura remains a live theological and philosophical controversy rather than a settled question, even within Christian scholarship. Protestant theologians generally affirm the principle while disagreeing substantially about its scope and practical application - disagreements that underlie many intra-Protestant doctrinal disputes. Critics from Catholic, Orthodox, and some Anglican traditions argue that the principle is self-refuting: the canon of Scripture was itself determined by ecclesial authority, and Scripture nowhere explicitly teaches that it alone is sufficient as a rule of faith. Proponents respond that the Church recognized rather than constituted the canon, and that Scripture's authority is intrinsic rather than delegated.

A further internal debate distinguishes solo scriptura - the view that each individual reads Scripture without any tradition - from the classical Reformation position, which acknowledged the usefulness of creeds and confessions as subordinate standards derived from and accountable to Scripture. Critics of radical individualist readings argue they produce interpretive anarchy; defenders argue they guard against institutional corruption of doctrine.

No consensus. Sola scriptura is actively contested across Catholic, Orthodox, and Protestant traditions, and remains a point of substantive disagreement within Protestantism itself regarding scope and application.

• Classical Protestant: Scripture is the uniquely infallible and self-authenticating norm by which all other authorities are judged. Creeds and confessions are useful but fallible summaries. See Classical Protestant Viewpoint.

• Roman Catholic: Scripture and Sacred Tradition together constitute a single deposit of faith, interpreted authoritatively by the Church's magisterium. Sola scriptura is rejected as historically novel and internally incoherent. See Roman Catholic Viewpoint.

• Eastern Orthodox: Divine revelation is transmitted through the living Tradition of the Church, of which Scripture is a part. The principle of sola scriptura is regarded as a departure from the unified witness of the early Church. See Eastern Orthodox Viewpoint.

• Prima Scriptura: Scripture holds primary but not exclusive authority; tradition, reason, and experience serve as subsidiary sources. Associated with Anglican, Wesleyan, and some Lutheran approaches. See Prima Scriptura Viewpoint.

• Radical Individualist / Solo Scriptura: Each believer interprets Scripture without binding deference to any creedal or confessional tradition. Distinct from classical Reformation sola scriptura; often associated with Anabaptist and certain free-church traditions. See Solo Scriptura Viewpoint.

• Sola Scriptura - History
• Sola Scriptura - Debate
• Roman Inquisition
• Protestant Reformation
• Biblical Canon
• Council of Trent
• Sacred Tradition
• Hermeneutics

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