Mental refining is a test of the will of the passer.As long as the cultivation heart is stable and there are no distractions, it is not difficult to pass, but for some cultivators who are not strong in mind and half-hearted, it may be a more difficult test than physical cultivation.If there are still demons in the heart, then this level of heart refining will not be able to pass no matter what.The leaders of the Quartet forces can cultivate to their level, and most of their hearts and wills are extremely tenacious and stable, so they have also passed the test, and it is not uncommon for them to break the game more than the thunder tdcssotchaterbarotgt,,; mobile phone reading,