Lewis, against Docetism

"You are silly, Bree," said Aravis.

"By the Lion's Mane, Tarkheena, I'm nothing of the sort," said Bree indignantly. "I have a proper respect for myself and for my fellow horses, that's all."

"Bree," said Aravis, who was not very interested in the cut of his tail, "I've been wanting to ask you something for a long time. Why do you keep swearing By the Lion and By the Lion's Mane? I thought you hated lions."

"So I do," answered Bree. "But when I speak of the Lion of course I mean Aslan, the great deliverer of Narnia who drove away the Witch and the Winter. All Narnians swear by Him."

"But is he a lion?"

"No, no, of course not," said Bree in a rather shocked voice.

"All the stories about him in Tashbaan say he is," replied Aravis. "And if he isn't a lion why do you call him a lion?"

"Well, you'd hardly understand that at your age, " said Bree. "And I was only a little foal when I left so I don't fully understand it myself."

...

"No doubt, " continued Bree, "when they speak of him as a Lion they only mean he's as strong as a lion or (to our enemies, of course) as fierce as a lion. Or something of that kind. Even a little girl like you, Aravis, must see that it would be quite absurd to suppose he was a real lion. Indeed it would be disrespectful. If he was a lion he'd have to be a Beast just like the rest of us. Why!" (and here Bree began to laugh) "If he was a lion he'd have four paws, and a tail, and Whiskers! ... Aie, ooh, hoo-hoo! Help!"

For just as he said the word Whiskers one of Aslan's had actually tickled his ear.

...

"Now Bree," he said, "you poor, proud, frightened horse, draw near. Nearer still, my son. Do not dare not to dare. Touch me. Smell me. Here are my paws, here is my tail, these are my whiskers. I am a true Beast."

"Aslan," said Bree in a shaken voice. "I'm afraid I must be rather a fool."

"Happy the Horse who knows that while he is still young."

The Horse and His Boy