Introduction
The doctrine of sanctification has been interpreted and developed throughout the history of the Christian Church. While the biblical foundations of sanctification are found in the Old and New Testaments, theologians across different periods have sought to explain how holiness develops in the life of believers and how divine grace interacts with human obedience.
From the early church to the Reformation and beyond, Christian thinkers have offered various perspectives on sanctification. Although these perspectives sometimes differ in emphasis, they all share the conviction that believers are called to grow in holiness through the transforming work of God.
Sanctification in the Early Church
In the early centuries of Christianity, sanctification was closely associated with spiritual transformation and moral renewal. Early Christian writers often emphasised the idea that salvation involves becoming more like Christ.
One of the most influential early theologians was Augustine of Hippo (354–430). Augustine emphasised the necessity of divine grace in the process of sanctification. In his writings, he argued that human beings cannot achieve holiness through their own efforts but require God’s grace to overcome the power of sin.
Augustine also emphasised the role of the Holy Spirit in transforming the believer’s heart. For Augustine, sanctification involved the gradual reordering of human desires so that love for God becomes the central orientation of life.
Sanctification in Medieval Theology
During the medieval period, theologians sought to explain sanctification within a broader framework of sacramental theology and spiritual formation.
A key figure in this period was Thomas Aquinas (1225–1274). Aquinas described sanctification as the process by which believers receive sanctifying grace, which transforms the soul and enables it to grow in virtue.
According to Aquinas, the Christian life involves the cultivation of theological virtues such as faith, hope, and love. Through these virtues, believers participate in the life of God and gradually grow in holiness.
Medieval theology therefore emphasised both divine grace and moral formation, viewing sanctification as a lifelong process that shapes the believer’s character.
The Reformation and the Renewal of the Doctrine
The Protestant Reformation in the sixteenth century brought renewed attention to the relationship between justification and sanctification.
One of the central figures of the Reformation was Martin Luther (1483–1546). Luther strongly emphasised justification by faith alone and warned against any teaching that might suggest that human works contribute to salvation.
However, Luther also affirmed that genuine faith produces transformation. Sanctification, in his view, naturally follows justification as believers grow in obedience and gratitude to God.
Another major Reformation theologian, John Calvin (1509–1564), placed particular emphasis on union with Christ as the foundation of sanctification. Calvin argued that believers cannot receive the benefits of Christ without also experiencing transformation through the work of the Holy Spirit.
For Calvin, justification and sanctification are distinct but inseparable aspects of salvation.
The Wesleyan Emphasis on Holiness
In the eighteenth century, the Methodist movement brought renewed attention to the theme of holiness within Christian life.
The movement’s founder, John Wesley (1703–1791), emphasised the importance of holy living and spiritual growth. Wesley taught that sanctification involves a progressive transformation in which believers grow in love and obedience.
Wesley also introduced the idea that believers could experience a deeper work of grace sometimes described as entire sanctification or Christian perfection, meaning a life characterised by perfect love for God and neighbour.
Although this teaching has been interpreted in various ways, Wesley’s emphasis on holiness had a lasting influence on evangelical spirituality and the modern holiness movement.
Modern Perspectives on Sanctification
In modern theology, sanctification continues to be understood as a central aspect of Christian life. Many contemporary theologians emphasise the role of the Holy Spirit, the importance of community within the Church, and the integration of spiritual formation with daily life.
Modern scholarship often highlights that sanctification is both individual and communal. Believers grow in holiness not only through personal devotion but also through participation in the life of the Church, where teaching, worship, and fellowship nurture spiritual maturity.
Despite differences among traditions, most Christian theologians agree that sanctification involves the gradual transformation of believers into the likeness of Christ.
Conclusion
Throughout the history of the Church, the doctrine of sanctification has remained central to Christian theology. Early church fathers emphasised the necessity of divine grace; medieval theologians developed the concept of sanctifying grace and virtue; Reformers clarified the relationship between justification and sanctification; and later movements renewed the emphasis on holy living.
These historical perspectives demonstrate that the pursuit of holiness has always been a defining feature of the Christian life. While theological explanations may differ, the central conviction remains the same: believers are called to grow continually in holiness as they follow Christ.
In the next part of this series, we will explore spiritual disciplines and practices that help believers cultivate holiness in everyday life.
References
Aquinas, T. (1947) Summa Theologica. New York: Benziger Brothers.
Calvin, J. (1960) Institutes of the Christian Religion. Philadelphia: Westminster Press.
Luther, M. (1961) Luther’s Works. Philadelphia: Fortress Press.
McGrath, A. (2012) Historical Theology: An Introduction to the History of Christian Thought. Oxford: Wiley-Blackwell.
Wesley, J. (1872) A Plain Account of Christian Perfection. London: Epworth Press.
The Holy Bible, New International Version (2011). Grand Rapids: Zondervan.