Union with Christ
Last updated: 2026-04-10
Union with Christ is the spiritual and mystical work of God's grace by which believers are inseparably joined to Jesus Christ as their head. Through this union, the elect participate in his life, death, and resurrection, enjoying communion with him and one another.
🔗 A Spiritual and Mystical Union
Union with Christ is the foundational blessing of the gospel. As noted in the 1689 LBCF Ch.27 §1, all saints are united to Christ, their head, through the indwelling of his Spirit and the gift of faith. While Reformed and Presbyterian traditions differ on various aspects of covenantal application, there is broad agreement that this union is a work of God's grace, described as both spiritual and mystical (Westminster Larger Catechism Q.66). It is not a merger of essence, but a real, life-giving bond where the believer is joined to the Savior.
Sources: 1689 LBCF Ch.27 §1 · Westminster Larger Catechism Q.66
🍇 Partaking in the Life of Christ
Because we are united to Christ, his story becomes our story. We share in his graces, his death, and his glorious resurrection (1689 LBCF Ch.27 §1). As the Apostle Paul writes, 'I have been crucified with Christ; and it is no longer I that live, but Christ living in me: and that life which I now live in the flesh I live in faith, the faith which is in the Son of God, who loved me, and gave himself up for me' (Galatians 2:20). This means we are no longer defined by our sin, but by his righteousness. We are more flawed than we dared believe, yet more loved in Christ than we dared hope.
Sources: 1689 LBCF Ch.27 §1 · Galatians 2:20
Union with Christ is the foundational bond from which all other benefits of salvation flow, as we are joined to Him as our head and mediator. Justification, adoption, and sanctification are not separate additions to our standing but are the fruit of being "in Christ," whereby we participate in the virtue of His perfect life and sacrificial death.
🌱 The Source of Every Benefit
All the benefits of salvation—justification, adoption, and sanctification—are received solely through our union with Christ. As noted in the Westminster Larger Catechism Q.69, our communion with Christ involves partaking in the virtue of His mediation. Because we are in Him, His righteousness is legally imputed to us in justification, and we are brought into God's family through adoption. This union is the singular, vital root of all saving grace, as the Westminster Shorter Catechism Q.32 highlights that these benefits flow directly from our effectual calling and subsequent union with the Savior. As the Apostle Paul writes, "but of him are ye in Christ Jesus, who was made unto us wisdom from God, and righteousness and sanctification, and redemption" (1 Corinthians 1:30).
Sources: Westminster Larger Catechism Q.69 · Westminster Shorter Catechism Q.32 · 1 Corinthians 1:30
🔥 Sanctification in Christ
Sanctification is the process whereby we grow in holiness, not to earn God's favor, but because we are already united to Christ. The 1689 LBCF Ch.13 §1 teaches that those who are united to Christ have a new heart created in them through the virtue of His death and resurrection. This union means that we are no longer under the dominion of sin, but are empowered by His Spirit to mortify the flesh. We do not obey to become acceptable; we obey because we are already accepted and loved in Christ, and through this union, we are enabled to practice true holiness. As Scripture says, "For if we have become united with him in the likeness of his death, we shall be also in the likeness of his resurrection" (Romans 6:5).
Sources: 1689 LBCF Ch.13 §1 · Romans 6:5
Because you are truly united to Christ, your daily life is no longer a struggle to earn God's favor, but the joyful expression of His life already working within you. This union ensures that your sanctification is as certain as your justification, as you are empowered by His Spirit to increasingly die to sin and live to righteousness.
🌱 From Performance to Participation
In the Reformed tradition, our practical life is anchored in the reality that we are already "in Christ." Because we are united to Him, we partake in the virtue of His death and resurrection, as noted in the 1689 LBCF Ch.13 §1. This means that when we face temptation or the weight of our own failures, we are not trying to climb a ladder to reach God; rather, we are walking in the strength of a grace that is already ours. As the Westminster Larger Catechism Q.69 explains, our communion with Christ involves partaking in His mediation. This shifts the focus of the Christian life from moralism—where we obey to be accepted—to gospel-driven living, where we obey because we are already accepted in the Beloved.
Sources: 1689 LBCF Ch.13 §1 · Westminster Larger Catechism Q.69
⚡ The Power of the Resurrected Life
Daily holiness is not a work of our own self-generated willpower but is the result of the Spirit of God working within us. The 1689 LBCF Ch.13 §1 emphasizes that we are 'quickened and strengthened in all saving graces' through the Word and the Spirit. Jesus Himself illustrated this reality when He said, 'I am the vine, ye are the branches: He that abideth in me, and I in him, the same beareth much fruit: for apart from me ye can do nothing' (John 15:5). This gives us profound comfort: you are more sinful than you dared believe, but because of your union with Christ, you are more loved and empowered than you dared hope. Your growth in holiness is the fruit of the Vine, not the result of your own independent labor.
Sources: John 15:5 · 1689 LBCF Ch.13 §1
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