This Greek word is found four times in the New Testament: Romans 12:2; in II Corinthians 3:18 to describe our being transformed into the glorious likeness of Jesus Christ; it is mentioned twice in the gospels of the transfiguration of Jesus on the mountain where He had gone with Peter, James, and John.
The same word used by Paul to describe our transformation by the renewing of our minds, so that we will not be conformed to this world, is used by the gospel writers to describe the transfiguration of Jesus from the form of his earthly humiliation to the radiance that Peter, James, and John were privileged to witness for a time. And that is why Paul writes as he does in II Corinthians, saying: