"True epics of course are few and historically well spaced, but that slightly more mundane ingredient, the speculative impulse, be it of Classic, Christian or Renaissance shading, which ornamented Western literature with romances, fables, exotic voyages and utopias, seemed to me basically the same turn of fancy exercised today in science fiction, working then with the only objects available to it. It took the Enlightenment, it took science, it took the industrial revolution to provide new sources of idea that, pushed, poked, inverted and rotated through higher spaces, resulted in science fiction. When the biggest, the most interesting ideas began emerging from science, rather than from theology or the exploration of new lands, hindsight makes it seem logical that something like science fiction had to be delivered."