What governs sanctification?Is holiness measured by inward experience, emotional intensity, or perceived moral progress-or is it governed by divine judgment, revealed truth, and covenantal authority? In Propositional Sanctification: Authority, Judgment, and Holiness, S. C. Sayles argues that contemporary confusion surrounding sanctification is not primarily pastoral or psychological, but jurisdictional. The problem is not that Christians deny sanctification, but that they increasingly misgovern it-relocating authority from Scripture to experience, from divine verdict to self-assessment, and from revealed truth to therapeutic or moral intuition. Proceeding from a rigorously Reformed framework, Sayles presents sanctification not as a subjective journey to be narrated, nor as a technique to be managed, but as a reality governed by propositions-truth-claims that must be fixed before obedience can be rightly understood. Holiness, he contends, advances not where experience is intensified, but where false judgments are exposed and replaced by submission to what God has spoken. The work is structured around twelve governing propositions that together form a doctrinal architecture of sanctification. These propositions are not stages of growth or thematic reflections; they are jurisdiction-setting claims that secure the doctrine against moralism, legalism, antinomianism, experientialism, and psychological reduction.Among its central claims: Sanctification is governed by divine authority before it is expressed in moral changeUnion with Christ, not aspiration toward holiness, is the source of sanctificationSanctification is monergistic in power, though exercised in real obedienceThe noetic effects of sin persist in the regenerate, requiring ongoing judgment by ScriptureLaw and Gospel must be distinguished without separationPerseverance is God-wrought and certain, not contingent upon performanceSanctification proceeds through the ordinary means of grace, within the church, under providence, toward final glorificationThroughout, Sayles insists that sanctification must never be allowed to function as a second court of justification. Obedience is real, demanding, and necessary-but it never issues the verdict. Assurance rests where Scripture places it: Sanctification is easily moralised, psychologised, or sentimentalised; a propositional structure prevents silent redefinitions and forces every claim to answer the question of authority. What court governs this doctrine? Who has the right to name holiness? Propositional Sanctification is not a devotional manual, a therapeutic guide, or a mystical spirituality. It does not offer techniques, stages, or introspective diagnostics. It does not promise rapid transformation or emotional uplift. Instead, it offers something rarer and more demanding: doctrinal stability. Written with pastoral seriousness and theological restraint, this work is intended for pastors, theologians, serious students of Reformed doctrine, and readers weary of accounts of sanctification that oscillate between anxiety and illusion. It speaks with clarity where Scripture already speaks decisively and refuses to soften divine authority in the name of accessibility.Sanctification, Sayles argues, is not a project the Christian manages. It is a life lived under authority, under judgment, and under grace. Where that order is restored, obedience becomes intelligible without becoming self-authorised, assurance becomes stable without becoming introspective, and holiness is freed from the burden of self-interpretation. This is sanctification recovered, not reinvented.