I am doubtful myself about the undertaking. Part of the attraction of the L. R. is, I think, due to the glimpses of a large history in the background: an attraction like that of viewing far off an unvisited island, or seeing the towers of a distant city gleaming in a sunlit mist. To go there is to destroy the magic, unless new unattainable vistas are again revealed. Also many of the older legends are purely 'mythological', and nearly all are grim and tragic: a long account of the disasters that destroyed the beauty of the Ancient World, from the darkening of Valinor to the Downfall of Númenor and the flight of Elendil.

No. 247 - The Letters of J. R. R. Tolkien (1981)