Sometimes the question comes up: if we are united with Christ, does that mean we somehow lived His entire earthly life — His 33 years of obedience, His Torah-keeping, His miracles, His ministry? Romans 8 is often quoted here, so let’s walk carefully through the passage.
Romans 8:3–4 — What It Says
“For God has done what the law, weakened by the flesh, could not do. By sending His own Son in the likeness of sinful flesh and for sin, He condemned sin in the flesh, in order that the righteous requirement of the law might be fulfilled in us, who walk not according to the flesh but according to the Spirit.”
Paul makes two claims here:
- Jesus came in the likeness of sinful flesh and condemned sin through His body.
- The righteous requirement of the law is fulfilled in us as we walk by the Spirit.
Did We “Live” His Earthly Life?
Some might read this and think, “If righteousness is fulfilled in me, maybe I mystically lived out Jesus’ perfect law-keeping.” But that is not what Paul is saying.
- He never says: “You kept the law in Christ’s 33 years of earthly life.”
- Instead, he says: Jesus condemned sin in His body — climaxing at the cross.
- Because of that, the requirement of the law is fulfilled in us, not by repeating His biography, but by the Spirit’s work in us.
Romans 5:19 and Romans 8 Together
Romans 5:19 clarifies this:
“By the one man’s obedience the many will be made righteous.”
This obedience is Jesus’ whole life, culminating in His obedience unto death (Phil 2:8). He qualified as the spotless Lamb, the perfect substitute.
- His obedience is credited to us — that’s justification.
- His death and resurrection are shared with us — that’s mystical union.
- His Spirit now empowers us to live in freedom — that’s sanctification.
Romans 8:4 then explains how this works out practically: the Spirit enables believers to fulfill God’s righteous requirement, not by external law-keeping, but by walking in the Spirit.
What Union Really Means
So mystical union doesn’t mean I was mystically in Galilee with Him, multiplying bread or preaching sermons. It means:
- I was crucified with Him (Gal 2:20).
- I was buried with Him (Rom 6:4).
- I was raised with Him (Col 3:1).
- I am seated with Him (Eph 2:6).
Those are the saving events I share in.
His earthly obedience is not mystically replayed in me. Instead, it is credited to me and applied in me by the Spirit.
The Spirit’s Fulfillment in Us
Romans 8:4 makes it practical:
- The “righteous requirement of the law” is fulfilled in us not because we relived Christ’s life, but because the Spirit enables a new way of life.
- Law-keeping was powerless (Rom 8:3), but the Spirit empowers obedience from the inside out (Rom 8:5–9).
- This is holiness flowing from union, not from imitation.
Conclusion
Romans 8 doesn’t say we mystically lived Jesus’ 33 years of earthly life. It says that through His incarnation, obedience, and death, sin was condemned. His righteousness is credited to us, and His Spirit fulfills God’s requirements in us.
So yes, we are mystically united with Christ — but specifically in His death, burial, resurrection, and ascension. His perfect life qualifies Him as the spotless Lamb; His cross and resurrection unite us with Him forever.
The gospel is not that I replayed Jesus’ life — it’s that His life, death, and resurrection were given to me, and His Spirit now lives in me.
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