W. Y. Evans-Wentz,
The Fairy-Faith in Celtic Countries
“ When we stop to consider how long it may have taken the Brythonic Fairy-Faith, as well as that of the Gaels, to become so widespread and popular among the Celtic peoples that it could take such definite shape as it now shows in all the oldest manuscripts in different languages, we can easily wander backward into periods of enlightenment and civilization beyond the horizon of our little fragments of recorded history. Who can tell how many ages ago the Fairy-Faith began its first evolution, or who can say that there was ever a Celt who did not believe in, or know about fairies? ”
