This was also the reason why Chu Li wanted to join the Heavenly Demonic Sect. With the Heavenly Demonic Sect's assistance, he could quickly improve his level of the Heavenly Demonic Power.
However, when he was in Ji Dynasty, he did not dare to expose the Heavenly Demonic Power. Neither did he as well when he became a part of the Amethyst Mountain as he could not devour the force of the experts publicly.
Now, through Elder Bai and the others, he knew that this was no simple task. The Heavenly Demonic Power was easy to cultivate but difficult to achieve a breakthrough. He must have a unique inner state and an exceptionally high level of comprehension, or else he would not make any progress despite having an abundance of inner energy.