Such unique and quick cultivation speed would definitely have its side effects and risks.
Chu Li understood well that everything on earth was a balance of Yin and Yang, bad and good. Heart technique that was mastered quick and powerful would mean its risk was high. Although one could not see much risk at this point of time that would mean that this risk was more dangerous.
Chu Li indistinctly felt that the fast pace advancement of the Heavenly Demonic Power would signify that there would be pitfalls at the end of the cultivation journey and during then, it would be too late to stop. This was accorded to the Heavenly Demonic character.
He had been resisting the temptation to cultivate.