There are certainly no books that have more influence my ability to lucid dream and experience out of body travel than the White Eagle Series. The White Eagle Books are a collection of Grace Cooke's channelings during the mid era of the 20th century. The Spiritual Unfoldment Series outlines a path of spiritual growth that produces many changes in ones perception. #2 in this series deals with the faerie kingdom of gnomes, sprites, undines and such..
I highly recommend for anyone seriously desiring to grow spiritually and develops skills in out of body travel, lucid dreaming and other psychic abilities.
