"I don't think it's usual anywhere or for anything but getting to Narnia, if that makes you feel any better."

Peter remembers when Lucy first told them about Narnia and the wardrobe. He and Susan were really rather skeptical. Edmund's beastly behaviour didn't help with that.

But Lucy had no reason to lie, and with a little bit of belief, they'd all discovered that the entrance to Narnia, and Narnia itself was very real.