User blog comment:Add799/Nine demon gates a type of celestial spirit magic?/@comment-24264679-20131207231852

Your theory sounds good but I doubt the 2 are related in that sense. Like someone already said maybe Zeref wanted something similar to the Celestial spirits so he created the books but even this is far fetched. The celestial spirits reside in a whole other dimension and only cares about the human world when it effects their master. With this being said only about 99.9% of the world know about the Celestial dimension it is a mystery. The celstial world could posses magics like the 3 great Fairy Spells, Etherion and face even more. You do have 9 powerful gates within the Celestial realm(Hydra, Draco, Phoenix, Orion, Persues, Herculus, Cassiopia, Andromeda, Cetus) and the king/Master of the realm(Cephus) so maybe Zeref wanted beings as strong as those but failed to do so.