“And after six days Jesus took with him Peter and James and John, and led them up a high mountain by themselves. And he was transfigured (μετεμορφώθη) before them,” (Mark 9:2)
“Do not be conformed to this world, but be transformed (μετεμορφώθη) by the renewal of your mind,” (Romans 12:2)
What was this transfiguration about? It was the in-breaking of a future world/age into the present one. It was Christ arrayed in His glorious nature, which be possessed before He came and what He will possess, shining forth before the disciple during his incarnation.
This is near to the same idea Paul has when he commands us to be transformed (μετεμορφώθη). A Savior who is bring an new heaven and new earth has appeared before us. And this everlasting life is upon us now. Whoever believes in the Son has eternal life” (John 3:36). We live in the already, not yet tension. Where the absolute glories of the next age are not consummated, but where next age is inaugurated.
Thus, our transformation is taking on the image of Christ and the glories of His kingdom and not the filth of the kingdom of this world. We are to take the form of another age; not the present world which is dominated by sin. Our lives are to an in-breaking of a future kingdom. A kingdom where we will love as Christ loved, think as Christ thought, feel as Christ felt. For this is the glorious kingdom which we long for. And now, by the power of the Spirit we no longer have to reside in the image of the present world/age but we can start to become an image of the coming world which will be lighted by the glories of Christ.