In Reformed theology, sanctification does not precede justification, as both are distinct but inseparable benefits of union with Christ. While God decrees both from eternity, they are applied to the believer simultaneously in the order of salvation, such that no one is declared righteous without also being fundamentally renewed.
Reformed theologians universally hold that while justification and sanctification are distinct, they are inseparably joined in the believer's life. As teaches, although they are united, they differ: justification is a judicial act of God whereby He imputes the righteousness of Christ and pardons sin, whereas sanctification is a process of grace whereby the Spirit subdues sin and renews the believer after the image of God. Because Christ cannot be divided, those whom He justifies, He inevitably sanctifies. Justification deals with the legal standing of the sinner before a holy God, while sanctification concerns the transformation of the sinner's life. To separate them—as if one could be justified without being renewed—is to deny the sufficiency of the work of Christ, for as declares, Christ is made unto us both righteousness and sanctification.
The Reformed tradition clarifies that the order of salvation is not a sequence of chronological stages where one finishes before another begins. According to both the and the , God decreed from eternity to justify the elect, and Christ died for their justification, yet individuals are not personally justified until the Holy Spirit applies Christ to them in time. This application of Christ, known as effectual calling, results in immediate regeneration. Regeneration is the seed from which both justification by faith and the lifelong process of sanctification grow. Therefore, a person is not 'partially' justified or 'pre-sanctified'; rather, upon the moment of faith, the believer is fully justified and simultaneously begins the work of sanctification. Because justification is a forensic act (a legal declaration), it is complete at once; sanctification, however, is a progressive work that lasts until death, yet it is rooted in the same union with Christ that makes justification possible.
It is essential to understand that sanctification is not a condition that the believer must fulfill to earn or precede justification. Instead, sanctification is the necessary evidence and fruit of a soul that has been justified. The Scripture warns in to follow after the sanctification without which no man shall see the Lord, indicating that a life devoid of growth in holiness is inconsistent with a profession of faith. This holiness is not something the sinner produces in their own strength; rather, it is the work of God’s grace. As promised in , God takes away the heart of stone and gives a heart of flesh. The gospel landing here is profound: because you are already held secure in Christ by justification, you are empowered by the Holy Spirit to walk in newness of life. To attempt to make sanctification happen 'before' justification would be to reverse the gospel, placing the burden of holiness on the sinner as a prerequisite for acceptance, whereas in Christ, acceptance is the foundation upon which the Spirit builds a life of holiness.
The Reformed family—comprising Presbyterians, Reformed Baptists, and the Continental Reformed—is remarkably unified on this point. Whether one references the , which defines sanctification as a work of God's free grace, or the , which emphasizes that those united to Christ and regenerated are sanctified through the virtue of Christ's death and resurrection, the conclusion remains the same. There is no Reformed position that holds that sanctification precedes justification. Where differences arise in this tradition, they typically pertain to the mechanics of how the law is used in sanctification (e.g., the Third Use of the Law) or the nature of the Sabbath, but none suggest an order where holiness is a prerequisite for God's forensic declaration of righteousness. All parties agree that justification is by faith alone and that sanctification is the necessary, Spirit-wrought transformation that follows. This protects the gospel from legalism (thinking works earn justification) and antinomianism (thinking faith does not require holiness).