1 Thess. 5:23-24, "And the very God of peace sanctify you wholly; and I pray God your whole spirit and soul and body be preserved blameless unto the coming of our Lord Jesus Christ. Faithful is he that calleth you, who also will do it."
This looks like a prayer to me. Jesus says:
John 15:7 : If you remain in me and my words remain in you, ask whatever you wish, and it will be given you.
So if we give Paul credit for remaining in Christ and His words remaining in him, then here is more evidence that there can be assurance of perseverance.
"[On POTS] Thanks, Harley."
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It seems that the difference between POTS and OSAS is in the question of whether the individual "choose" to be saved or was predestined. I've read the article and following justification both camps are in agreement.