"And she never could remember; and ever since that day what Lucy means by a good story is a story which reminds her of the forgotten story in the Magician's Book."This reminds me of what Lewis said in The Weight of Glory:
"The books or the music in which we thought the beauty was located will betray us if we trust to them; it was not in them, it only came through them, and what came through them was longing... For they are not the thing itself; they are only the scent of a flower we have not found, the echo of a tune we have not heard, news from a country we have never yet visited."
When Lucy saw Aslan,
"Her face lit up till, for a moment (but of course she didn't know it), she looked almost as beautiful as that other Lucy in the picture."I love how Lucy is most beautiful when she sees Aslan {Christ}
Aslan has to keep his own rules.
I wondered at the meaning of the Dufflepods. I think this line about them, spoken by the Magician, gives some insight:
"Sometimes, perhaps, I am a little impatient, waiting for the day when they can be governed by wisdom instead of this rough magic."Aslan cannot show himself to them because it would frighten them. They are not yet ready for him.