Countless upon countless profound aspects of cultivation existed during each and every stage of cultivation, constituting the difficulties of cultivation that an uncountable number throughout all of existence kept harping about from the very depths of their souls. There existed an obscure, almost irrelevant detail of cultivation that mattered very little, and it was mostly rendered useless due to an inviolable and irreversible fact: Upon ascending to embrace mysticism beyond common mortality, there was no descent to the mortal dust.
To translate: After assailing and entering the Mystic Ascension Realm, even after failing the test of unfathomable-to-mortals knowledge, and becoming a Mystic Star Phase cultivator, the lowest exalted being among Ascended beings, there was no path returning to the Mortal Dao.