ROOTED & GROUNDED
Theology for the thinking Christian | June 12, 2026
The most important two-word phrase in Paul's theology appears more than 160 times in his letters. You probably know it. But have you ever stopped to ask what it actually means?
The phrase is "in Christ." Paul uses it to describe where blessings come from (Ephesians 1:3), where identity is found (2 Corinthians 5:17), and where resurrection hope rests (1 Corinthians 15:22). It is not decorative language. For Paul, "in Christ" is the fundamental address of the Christian life: the zip code of salvation.
Theologians call this doctrine "union with Christ," and John Calvin thought it was the hinge on which everything else turned. In the opening lines of Book Three of his Institutes, Calvin wrote with unusual directness: "As long as Christ remains outside of us, and we are separated from him, all that he has suffered and done for the salvation of the human race remains useless and of no value for us." This is a bracing claim. The cross is not a transaction posted to a distant account that benefits you automatically. It is an event you must be joined to, incorporated into, made a participant in. The work of Christ becomes yours only when Christ himself becomes yours.
This is exactly what Paul describes in Romans 6. "Do you not know," he asks, almost exasperated, "that all of us who have been baptized into Christ Jesus were baptized into his death?" Christian baptism is not primarily a symbol of personal commitment. It is an enactment of union. You go under the water as one person and come up as another, because you have been joined to the death and resurrection of Jesus himself. "For if we have been united with him in a death like his, we shall certainly be united with him in a resurrection like his" (Romans 6:5). The past tense is important: this union has already happened. You are not working toward it. You are working from within it.
This changes the grammar of the Christian life entirely. Paul's declaration in Galatians 2:20 is the most intimate statement in his letters: "I have been crucified with Christ. It is no longer I who live, but Christ who lives in me. And the life I now live in the flesh I live by faith in the Son of God, who loved me and gave himself for me." Read it slowly. The old self has been executed, not reformed. But the person who writes these words is not a shell. He is more alive than before, living by faith in the Son of God, sustained by love that took the form of self-giving.
The pastoral weight of this doctrine is enormous. Many Christians treat the spiritual life as a long project of getting closer to Jesus: praying more, sinning less, building up a kind of proximity. But union with Christ says that the proximity is already given. You are in him. The struggle is not to close a gap but to live out of a reality already established. When doubt crowds in, when failure accumulates, when faith feels thin and far away, the answer is not a fresh transaction but a fresh reckoning with what is already true. You are not working toward a standing before God. You have one, in Christ.
The branch does not manufacture fruit. It abides, and the life of the vine does the rest.
Further Reading
- "Union with Christ" (The Gospel Coalition Essay) — A thorough theological overview tracing the doctrine from its Pauline roots through its systematic implications for justification, sanctification, and glorification.
- "Union with Christ in Paul's Epistles" by J.V. Fesko (Ligonier) — A close exegetical look at how the phrase "in Christ" functions across Paul's actual letters, with careful attention to what the preposition carries.
- "Union With Christ: One of the Secrets of Sanctification" (Desiring God) — Explores how being "in Christ" transforms not just our standing before God but the day-to-day work of becoming more like him.
You are not trying to get into Christ. You are already there, by grace, through faith. Let that be the ground you stand on today. May the life of the vine flow freely through you.
