" But whatever it is that they believe, the views they hold are altering this world; not only in the spirit, but on the material plane. As they deny the world of the spirit, and the realms of Avalon, so those realms cease to exist for them. They still exist, of course; but not in the same world with the world of the followers of Christ. "

― Marion Zimmer Bradley , The Mists of Avalon (Avalon, #1)