The very fact that we perceive it as evil, and despise it, rather than accepting it as just part of nature—hoof and horn, tooth and claw, is proof that it is unnatural, something other. If we were unable to perceive it as such, we would be truly lost—any belief in God would be merely a fantasy. Just as a fish doesn’t know it is wet, a world where evil was part of the intrinsic fabric of existence would be invisible to us. That we do see it and despise it tells us not only that it is not part of this world’s blueprint, but there is also a Good to which we can aspire and cling.
Indeed, by the same logic, the fact that we see and appreciate beauty, glory, joy, love and the other virtues tells us there is more to the world, and us, than mere survival of the fittest.
But is it mere dualism, just yin and yang, light and dark in an eternal contest, in conflicting balance, with us on the front line between them, with our blood serving as the lubrication of their machinations?