Before there was Robert Heinlein, Stranger in a Strange Land or The Moon is a Harsh Mistress, water-sharing, grokking, TANSTAAFL, and line marriage, there was Edward Bulwer-Lytton and The Coming Race, published in 1871.
As Egil Asprem recently noted in a blog post titled “The (all too) secret history of Vril,”
It is astonishing how much of modern occultism is dependent on works of fiction. The machinations of secret societies, the malicious rituals of satanic cults, and the magicians’ adventures on the astral plane have all been portrayed in great detail in works of fiction, which have in turn directly influenced the creation of real organisations and inspired new ritual practices among self-styled occultists. The entire current of Rosicrucian initiatory societies even had its main impetus in a text considered by its authors to be a playful ludibrium — although no doubt one that expressed deep convictions.