Dude! I just thought of something brilliant! I'm writing an essay on time travel...?

So I thought, wouldn't it be awesome if my future self walked in with a completed essay write now? But isn't this some type of paradox? Say I get the essay from my future self, keep it for 10 or 20 years, then go back in time to give the essay to my present self. Where did the essay come from? What does it say? Who wrote it?