"I am crucified with Christ: nevertheless I live; yet not I, but Christ liveth in me: and the life which I now live in the flesh I live by the faith of the Son of God, who loved me, and gave himself for me." -- Galatians 2:20"But by the grace of God I am what I am: and his grace which was bestowed upon me was not in vain; but I laboured more abundantly than they all: yet not I, but the grace of God which was with me." -- 1 Corinthians 15:10
The problem stems from the RC misunderstanding of justification (acquitted once for all the sins of the elect) and sanctification (the ongoing, predestined work of the Holy Spirit to bring the elect to repentance, obedience and faith.)
I don't have a foggiest idea why anyone would believe such nonsense. "Work out your salvation with fear and trembling for it is God working with you", no?