@penderor: Um yeah, I'm pretty aware of that. The "luminous beings we are, not this crude matter" part could be traced back to Buddhism for example but that's not the point. What I like is how it presents a cosmic, mystical force into a sci-fi setting, something that was very uncommon back then.
This whole "X thing isn't completely original" argument is utterly pointless, there's no such thing as original creations nowadays, everything follows a standard set of tropes and everyone is influenced by previous works of fiction in one way or another. The first Star Wars film has a ton of influences, from books, to movies, to movie serials, but that doesn't take away from it because of how it handles these influences. Same thing here, it's compelling because of how it's introduced and presented, not because of originality.