OSAS. God does not make mistakes. "He is the Author of our faith". "He knows the beginning from the end". The scriptures I shared state that we are chosen, predestined, called, sanctified and justifed by faith and sealed by the Holy Spirit. The new creature is made holy, pure in God's sight. "We have past from death to life". So the wages of sin has been paid for by Christ. His death was sufficient. If there was something more to be done to secure our salvation, then it would be implying that His death was not enough.
Of course we still live in this fleshly body, with the remnants of the old self. So now with the help, comfort, guidance, wisdom, love, teaching, edification, convictions of the Holy Spirit, Who dwells in us, we are encouraged daily to walk in the Spirit, not in the flesh. Everyday we start out with a prayer for wisdom and guidance to deal with the days new challenges, obstacles and evils. We are really to be on prayer without ceasing, having a continual open channel to God with everything decision and act. But we don't always do that, we get involved sometimes entangled and are faced with difficulties we struggle with - because we try to wing it ourselves. We leave God out of it, as if saying, "I got this Lord"! Sure you do. Don't leave God out of anything!
It is apparent that we still sometimes do the same things as the unregenerate do, we sin. But it is not sin unto death, we don't habitually live like we used to. "Be transformed by the renewing of your mind." So spiritual maturity takes time. Simply, we learn how to he more loving. His two commandments were to love God and love our neighbor - even our enemies! That's easy to say, but not to do. We fall short all the time. We are selfish at times and just don't feel like it: "Sorry I can't love you today, I have other plans, personal matters to attend to ... I'll pray for you." We chose not to love at a moment that we could have and should have. We disobeyed the commandment. We get the idea of what sin is from the Ten Commandments. So we try to keep them, but sometimes fail. Jesus said all the commandments fall under the two He gave.
So spiritually, sanctification is instant, we are made separate and are "in Christ". Now we must behave differently. The change in our behavior isn't instant, it is gradual, a process. If we all of a sudden were really like Jesus, the world would see it. They would see that Joe was a drug addict, a cussing, back stabbing, thief, whoremaster, wicked man and now is a pure Saint _ overnight. He traveled to India and took Mother Teresa's spot, working with the impoverished orphans ... No, I think so. It doesn't happen that fast. Some healing can miraculously take place like a drug addiction cure and certanly a miracle does take place, a new creature, but normally we grow to be like Christ. Paul had a miraculous transformation, but not everyone has that abrupt change. He still had to grow and learn the way. It took time.
I am not a Catholic, but I consider them brothers and sisters in Christ. I remember an interview with Mother Teresa before she died. The reporter asked her, " Who will take your place after you have gone?" She looked at her and said, "You can!" Wow, an uncomfortable silence came over the reporter, an apparent instant rejection and guilt at the same time, as if appalled... "Who me ... I can't ... do that. It is not my calling ... " Whatever she thought or said, it was clear that her answer was no. And most us would say no to that, right? She was likely a Catholic, likely single without children and a good person - saved. But "No, not me"! We say that often don't we, when given the opportunity to love one another, NO!
Sorry for the lengthy post. This OSAS has been a heated topic for generations. There are paradoxes in the Bible. My Pastor used to say, "There is a tension between the two realms ( physical and spiritual). We are in the already, but not yet state of eternal existence."
Some day we will be rid of this tent and separate from it and ascend to be who we were meant to be, when our redemption is fully consummated, perfect. We are waiting for our resurrection, our new bodies.