...the Resurrection was the greatest 'eucatastrophe' possible in the greatest Fairy Story- and produces that essential emotion: Christian joy...Of course I do not mean that the Gospels tell what is *only* a fairy-story; but I do mean very strongly that they do tell a fairy-story: the greatest. Man the story-teller would have to be redeemed in a manner consonant with his nature: by a moving story. *But* since the author of it is the supreme Artist and the Author of Reality, this one was also made to Be, to be true on the Primary Plane. So that in the Primary Miracle (the Resurrection) and the lesser Christian miracles too though less, you have not only that sudden glimpse of the truth behind the apparent Ananke of our world, but a glimpse that is actually a ray of light through the very chinks of the universe about us.
"Letters of J.R.R. Tolkien", Letter 89, To Christopher Tolkien, 7-8 November 1944