to be transformed: to be changed by God from one form into another that truly expresses a deeper reality
This verb, "metamorphoō," means to be changed into a new form: not a disguise on the surface, but a real change that lets a deeper reality show. It is the word English borrows for "metamorphosis." It appears only four times in the New Testament, and its force shifts sharply depending on who is being changed.
Twice it describes Jesus on the mountain, when he was "transfigured" in front of three of his disciples (Matthew 17:2; Mark 9:2). The change was sudden and visible: his face and clothing blazed with light. Scholars agree this did not turn Jesus into something he was not. It let his own hidden glory shine out, a real change in how he appeared that revealed what was already true of him, and it gave the disciples a preview of the glory he would have after the resurrection.
The other two times, Paul uses it of ordinary Christians, and the change is inward, slow, and ongoing: believers "are being transformed" into the image of Christ, "from glory to glory" (2 Corinthians 3:18), as their minds are made new (Romans 12:2). Both times the wording makes God, through his Spirit, the one who does the changing. What the disciples saw in a flash on the mountain, Paul says is happening quietly in every believer and will be complete only at the resurrection.
In everyday Greek this was a common word for shape-changing, the word behind old myths of gods turning into animals or people. The New Testament writers did not avoid that background; they took the word over and filled it with a new meaning. It is worth setting beside another Greek verb for changing only the outward look (μετασχηματίζω), which Paul can use for a mere disguise: this word, by contrast, names a change that reaches all the way to the form itself.
Nuances
How far the transformation in this verse reaches: a real sharing in God's own life and glory (often called theosis or christosis), or a genuine moral renewal into Christ's likeness that stops short of sharing God's being.
- majorityA real but progressive moral transformation into Christ's likeness, worked by the Spirit and consummated at the resurrection, not a sharing in God's own nature.; D. J. Moo, The Epistle to the Romans (NICNT, 2nd ed. 2018); T. R. Schreiner, Romans (BECNT, 2nd ed. 2018), 646-647; J. D. G. Dunn, Romans 9-16 (WBC 38B, 1988); C. E. B. Cranfield, Romans (ICC, 1975-1979)
- minorityA genuine participation in God's life and glory, stronger than moral improvement, though the creature remains distinct from the Creator (theosis or christosis).; M. J. Gorman, Inhabiting the Cruciform God (Eerdmans, 2009); M. D. Litwa, We Are Being Transformed (BZNW 187, De Gruyter, 2012); B. C. Blackwell, Christosis (WUNT 2/314, Mohr Siebeck, 2011); Athanasius, De Incarnatione 54; Cyril of Alexandria; Gregory Palamas, Triads