“Please, Lamb,” said Lucy, “is this the way to Aslan’s country?”
“Not for you,” said the Lamb. “For you the door into Aslan’s country is from your own world.”
“What!” said Edmund. “Is there a way into Aslan’s country from our world too?”
“There is a way into my country from all the worlds,” said the Lamb; but as he spoke his snowy white flushed into tawny gold and his size changed and he was Aslan himself, towering above them and scattering light from his mane.
“Oh, Aslan,” said Lucy. “Will you tell us how to get into your country from our world?”
“I shall be telling you all the time,” said Aslan. “But I will not tell you how long or short the way will be; only that it lies across a river. But do not fear that, for I am the great Bridge Builder…”
–The Voyage of the Dawn Treader, C. S. Lewis – Chapter 16