What is chaos?

With the passing of Luna and Celestia, the princess of the sun left one final letter to her student while on the verge of death. Not long after Twilight comes across an old abandoned book that she herself threw away because of the nonsense contained within its covers. It may have been written by one of the greatest unicorn minds in the history of Equestria, Starswirl the Bearded, but they were nothing more than the ravings of a suicidal mad pony long after he lost his grasp on sanity.

Or were they?