I think that repetition can work sometimes, but the word "today" doesn't seem to be a good word for it, since it's a reference to the time when something is happening. And if you don't indicate a lot of time passing, it should be clear from context that it's still the same day. I think your repetition of devil works better because it's a being that has a lot of power, so repeating it helps convey the level of strength the devil has.