Maybe he is referencing to wilful sin, the fact that God can only put up with it for so long. Even sinners have a limit on them, that causes God to act in wrath if they dont repent.He is quoting Scripture with the keeping power of God but then it sounds like he also says if you sin too much you are not saved.
If that's the case, where's the "line" where if you sin "this much" you are not saved anymore.