J.R.R. Tolkien spoke of myths and fairy stories, rather than "fantasy." He believed that mythology was a means of conveying certain transcendent truths which are almost inexpressible within the factual confines of a "realistic" novel.
"Fantasy is not just whimsical ego-nonsense but comes really from the depths; it constellates symbolic situations which give life a deeper meaning and a deeper realization." Marie-Louise von Franz in her book The Interpretation of Fairy Tales. http://vsb.li/tVKBNE
"Such attending to the psycho-logic of myth and the mytho-logic of the psyche's processes might be described as an exploration in mythopoeisis, in soul making, for it gives us some sense of how the soul, our soul, is given its shape through poetry, through images. Christine Downing, The Goddess: Mythological Images of the Feminine http://vsb.li/1rVl5f