Voyage of the Dawn Treador Ending

This is part of the ending of Narnia: Voyage of the Dawn Treader. Since the end of the summer I've been reading this book and finally finished it last night and was struck by this part.

“Please, Aslan,” said Lucy. “Before we go, will you tell us when we can come
back to Narnia.”

“Dearest,” said Aslan very gently, “You and your brother will never come back to
Narnia.”

“Oh, Aslan!” said Edmund and Lucy both together in despairing voices.

“You are too old, children,” said Aslan, “and you must begin to come close to your own world now.”

“It isn’t Narnia, you know,” sobbed Lucy. “It’s you. We shan’t meet you there. And
how can we live, never meeting you?”

“But you shall meet me, dear one,” said Aslan.

“Are-are you there too, Sire?” said Edmund.

“I am” said Aslan. “But there I have another name. You must learn to know me by
that name. This was the very reason why you were brought to Narnia, that by
knowing me here for a little, you may know me better there”