I think it's just different ways to describe yin and yang, light and dark, good and evil etc. Knowledge is a double-edged sword, it can confuse people, cause worry and anxiety if that knowledge seems to suggest there's something in the future to be frightened of, a bringer of light, for me suggests a teacher, someone to explain why a knowledge of the future is just an illusion (knowledge can only ever exist in the past) and it doesn't matter how certain one is of that future worrying about it won't change a thing. OTOH, knowledge can also improve our present.
The problem we have today is, there's very little that is beyond our ken, but again that is a double-edged sword. We know God can't exist, well those of us that can think critically, and that knowledge can dismiss what's been written because of all the contradictions, that only exist because we know it wasn't written by God/s.
Seems a shame that that basic concept was chosen to diffuse and evolve instead of the Piraha and their concept.