I don't subscribe to the system of confessional salvation. I don't believe one is flipping back and forth between being saved or not based on their whether they are properly confessed. Instead, I believe that the Spirit makes believers out of predestined unbelievers, regenerating them, drawing them into Christ, and guiding them into the ordinary means of grace (studying the word, praying, fellowship, and a life of repentence) and keeps them there until the end while God prepares them for Himself through sanctification, where the saint is progressively made more Christlike in his time.

Is there no physical representation of the actions of the Holy Spirit? In this case the sacrament of penance. Has the Christ left us with only the a, b, and can to go on? Can one on Earth not lose their sanctifying grace through committing mortal sin? Or do you posit that they never had this sanctifying grace if they could choose to commit mortal sin? If this is the case, could one chosen by God to be sanctified ever choose sin?