Just as anyone who listens to the muse will hear, you can write out of your own intention or out of inspiration. There is such a thing. It comes up and talks. And those who have heard deeply the rhythms and hymns of the gods, can recite those hymns in such a way that the gods will be attracted.
The Hero's Journey: Joseph Campbell on His Life and Work (ed. New World Library, 1990) - ISBN: 9781577314042