Hard testing is also known as slipping from grace.
Liars say you are continually allowed to sin and there are no consequences. I have seen this hard testing in all Synagogues of Christ. An example being the alcoholic that returns to drink, and boom an intervention, then back on the right track.
Those that say hard testing does not exist are deluded by false imaginings.
We could also call it grace in action or tough grace.
This concept allows Yahuah to intervene in human ways without being accused of being unrighteous.
Satan is lost.
HalleluYah.
