From the blog mentioned in the previous post I was reminded of this quote from the end of The Voyage of the Dawn Treader, which provides a beautiful picture of the biblical portrait of the new birth:
It would be nice, and fairly nearly true, to say that “from that time forth Eustace was a different boy.” To be strictly accurate, he began to be a different boy. He had relapses. There were still many days when he could be very tiresome. But most of those I shall not notice. The cure had begun.
The dragon-transformation, with the peeling off of the scales that is so painful yet feels so good, is, of course, another beautiful depiction of the new birth.
The whole post is worth reading.