The Transfiguration of Jesus in the gospels (Matthew 17; Mark 9; Luke 9) is a glimpse of the transformation of each of us by the power of the Holy Spirit (John 3:1-8) to become people transformed into the image of Christ.
This idea is strongly presented by Paul, an apostle, in 2 Corinthians 3:12-18, “Therefore having such a hope, we use great boldness in our speech, and are not like Moses, who used to put a veil over his face so that the sons of Israel would not look intently at the end of what was fading away. But their minds were hardened for until this very day at the reading of the old covenant the same veil remains unlifted, because it is removed in Christ. But to this day whenever Moses is read, a veil lies over their heart; but whenever a person turns to the Lord, the veil is taken away. Now the Lord is the Spirit, and where the Spirit of the Lord is, there is liberty. But we all, with unveiled face, beholding as in a mirror the glory of the Lord, are being transformed into the same image from glory to glory, just as from the Lord, the Spirit.”
When the veil is lifted and we can see and believe and be “transformed into the same image” of Jesus.
In 2 Corinthians 5:17, Paul calls this a “new creature” or creation. The New Living Translation says it this way: “This means that anyone who belongs to Christ has become a new person. The old life is gone; a new life has begun!” (5:17)
“I assure you, no one can enter the Kingdom of God without being born of water and the Spirit.” Jesus