"We all, with unveiled face, beholding the glory of the Lord, are being transformed into the same image from one degree of glory to another. For this comes from the Lord who is the Spirit" (2 Corinthians 3:18).
So how are we transformed? According to scripture, "with unveiled face" (meaning we see things as they really are) "beholding the glory of the Lord". So by gazing upon, beholding, and savoring God's glory we are changed. Then we learn, "for this comes from the Lord who is the Spirit". So this is a sovereign act of God the Holy Spirit working this transformation in us by way of our gazing upon His glory, after having already opened our minds to see the truth. It is all from God working in us but through the means of our loving, focusing on, gazing upon, and savoring Christ! That's how we become more holy...sounds a lot more appealing than following a bunch of rules and religious rituals! But once we're on the path of change from one degree of glory to the next, we love the rules and the rituals...oh the wisdom and majesty of our God!