If you're familiar with the series, you'll recall that the first book, "The Lion, the Witch, and the Wardrobe" introduced its heroes the Pevensies: Peter, Edmund, Susan, and Lucy. Close to the end of "The Last Battle", they make another appearance, minus one. And so the lead character in "Last Battle," King Tirian, asks:
"...if I have read the chronicles aright, there should be another. Has not your Majesty two sisters? Where is Queen Susan?"
"My sister Susan," answered Peter shortly and gravely, "is no longer a friend of Narnia."
"Yes," said Eustace, "and whenever you've tried to get her to come and talk about Narnia or do anything about Narnia, she says 'What wonderful memories you have! Fancy your still thinking about all those funny games we used to play when we were children.'"
"Oh, Susan!" said Jill, "she's interested in nothing now-a-days except nylons and lipstick and invitations. She always was a jolly sight too keen on being grown-up!"
"Grown-up, indeed," said the Lady Polly. "I wish she would grow up. She wasted all her school time wanting to be the age she is now, and she'll waste all the rest of her life trying to stay that age."
And that struck me as a mite sad. To be thrown out of a fairy tale just like that, or rather, to voluntarily leave and forget all that was.
We all must grow up, I suppose, but we should never forget where we came from, never forget that at one point, it was all Real, and that in many ways, it still is Real, and we all go back to it someday. We must Keep the Faith.
“I tell you unless you change and become like children, you will never enter the kingdom of heaven”.