The Marrow Controversy and the “Marrow Men” are frequently confused with the theological work The Marrow of Theology, but the two are historically and conceptually distinct, despite sharing the word “marrow” in their titles.
The confusion is understandable because both emerged from the broader Reformed and Puritan world and both sought to articulate the essential substance — the “marrow” — of authentic Christianity. Yet they belong to different moments, genres, and theological emphases within Protestant history.
William Ames was one of the most influential English Puritan theologians of the early seventeenth century. Born in 1576 and educated at Christ’s College, Cambridge, Ames became associated with the stricter Puritan wing of English Protestantism. His opposition to ecclesiastical conformity eventually forced him into exile in the Netherlands, where he served in academic and pastoral roles and became deeply influential within the Dutch Reformed world. Ames stood at the intersection of scholastic precision and experiential piety, seeking to unite rigorous doctrine with disciplined Christian living.
His most famous work, The Marrow of Theology (Medulla Theologiae), first published in Latin in 1623, became one of the defining theological textbooks of English-speaking Puritanism. I have a copy of the book on my shelf, published in 1968 by The Labyrinth Press.
The title itself is revealing. “Marrow” referred to the essential core or nourishing substance of theology. Ames did not intend to produce speculative philosophy or abstract metaphysics detached from life. Theology, for Ames, exists to shape holy living. His famous definition captures this orientation succinctly: “Theology is the doctrine or teaching of living to God.”
This practical orientation distinguished Ames from some forms of continental scholasticism that critics believed had become overly abstract. While Ames employed scholastic method and logical precision, he subordinated intellectual analysis to spiritual formation. Doctrine was never merely informational; it was transformational. Knowledge of God demanded obedience, discipline, and piety.
Structurally, The Marrow of Theology is a systematic theology. It progresses in ordered fashion through major doctrinal themes: Scripture, God, providence, creation, sin, covenant, Christ, salvation, the church, sacraments, ethics, and eschatology. The style is concise, aphoristic, and highly organised. In many ways, it resembles a theological manual or compendium intended for clergy and theological students. Its economy of language reflects the pedagogical style of Reformed scholasticism, where clarity, precision, and memorisation were highly valued.
Ames’s theological method reveals several important features of Puritan thought. First, he places enormous emphasis on covenant theology. Human beings relate to God covenantally, and redemption unfolds through divine covenant promises culminating in Christ. This covenantal framework became foundational for later Puritan and Presbyterian theology in Britain and New England.
Second, Ames integrates ethics deeply into doctrine. Unlike later forms of theology that separated dogmatics from ethics, Ames treated moral life as inseparable from theological truth. Christian obedience was not optional ornamentation but the necessary expression of regeneration. This gave Puritan theology its distinctive seriousness and moral intensity.
Third, Ames strongly emphasised the sovereignty of God and the authority of Scripture. Like much classical Reformed theology, his thought was profoundly shaped by Augustinian understandings of grace, predestination, and human depravity. Yet his pastoral concern prevented his theology from becoming emotionally detached. Ames sought not merely correct doctrine but spiritually disciplined believers.
The influence of The Marrow of Theology was immense. It became a standard textbook at Harvard College in early colonial America and shaped generations of Puritan ministers. Its combination of intellectual rigour and practical spirituality resonated deeply within Protestant communities seeking disciplined Christian societies. In many respects, Ames helped define the theological atmosphere that later characterised English Puritanism and New England Congregationalism.
By contrast, The Marrow of Modern Divinity — the book associated with the Marrow Controversy — belongs to a different theological genre and context. Published in 1645 by Edward Fisher, it was not a systematic theology textbook but a pastoral dialogue exploring grace, assurance, repentance, faith, and the relationship between law and gospel. Rather than offering orderly doctrinal exposition, it dramatized theological tensions through conversations between characters representing legalism, antinomianism, and evangelical faith.
The Marrow Men of eighteenth-century Scotland — including Thomas Boston, Ralph Erskine, and Ebenezer Erskine — derived their identity from Fisher’s work, not Ames’s. Their controversy revolved around the free offer of the gospel and the danger that Presbyterian preaching had become excessively legalistic. They feared that ministers were presenting repentance and moral preparation as conditions for receiving grace rather than fruits flowing from grace already given in Christ.
This distinction is crucial. Ames’s work belongs to the world of Reformed scholastic system-building and practical divinity, whereas the Marrow Controversy centred on pastoral application, assurance, and experiential Christianity. Ames asked how theology should be ordered and taught. The Marrow Men asked how grace should be preached to anxious sinners.
Nevertheless, the two traditions remain connected. Both sought a theology that shaped life rather than merely informed the intellect. Both resisted detached speculation. Both belonged to the wider Reformed tradition and shared commitments to Scripture, grace, covenant, and holiness. Yet their emphases diverged sharply.
Ames often reflects the disciplined moral seriousness of classical Puritanism. His theology can appear highly structured, covenantal, and ethically exacting. The Marrow Men, however, became concerned that precisely this kind of covenantal emphasis could unintentionally produce legalism and spiritual anxiety. They feared that Reformed orthodoxy had evolved into a subtle “new law” in which believers measured acceptance before God through moral performance.
Ironically, some historians argue that the Marrow Controversy exposed tensions already latent within traditions influenced by Ames and later Puritan covenant theology. The controversy was therefore not a rejection of Reformed theology itself, but an internal debate over how grace, assurance, and obedience should be understood within that theological system.
The Marrow of Theology is a seventeenth-century Puritan systematic theology devoted to the ordered presentation of Reformed doctrine and practical godliness. The Marrow of Modern Divinity is a pastoral and polemical work focused on grace, assurance, and the relationship between law and gospel. The Marrow Men and the Marrow Controversy arose from Fisher’s work, not Ames’s, even though both reflect the wider Reformed quest to discover the living “marrow” or heart of the Christian faith.
The quest continues.
Rev Dr Rod Benson is General Secretary of the NSW Ecumenical Council and a minister of the Uniting Church in Australia serving at North Rocks Community Church in Sydney.
Image source: This One Thing
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