Thanks for your explanation. Apparently, the distinction is based on the view of subsequent sin after regeneration. OSAS seems to not care about sin and the possibility of it effecting one's "secured" salvation, while POTS seems to say that one has not been regenerated unless there are signs of regeneration by not being enslaved to sin. POTS doesn't require perfection, but it seems clear to me that works are part of the formula.
In a sense, I can agree and understand POTS, as Catholics believe that love and faith go together as part of the package. A person who loves has obviously been regenerated. However, this seems to me more a current status. What proves that because you are a believer today and next week, that you are working in love and so forth, that you won't fall away next year? Is the perseverance commanded by God to us, or is God Himself persevering?
I would say that God perseveres in giving us the grace WE need to persevere...
Regards
POTS would say the following: