“Such a thing was surely not a physical or biochemical impossibility in the light of a newer science which includes the theoriesof relativity and intra-atomic action. One might easily imagine an alien nucleus of substance or energy, formless or otherwise, kept alive by imperceptable or immaterial subtractions from the life-force or bodily tissues and fluids of other and more palpably living things into which it penetrates and with whose fabric it sometimes completely merges itself. It might be actively hostile, or it might be dictated merely by blind motives of self-preservation. In any case such a monster must of necessity be in our scheme of things an anomaly and an intruder, whose extirpation forms a primary duty with every man not an enemy to the world’s life, health, and sanity.”
-H.P. Lovecraft, “The Shunned House”