Yes, I believe that it is possible for people to stop committing mortal sins - however, I think it is much more difficult to do this, without the graces of the Sacraments.
The people I know who are without serious sin in their lives, attend the Sacrament of Reconciliation a lot more frequently than just once a year - they go once a week, whether they need to or not, and they also attend Mass and receive Holy Communion daily, as well; they don’t limit themselves to once a week on Sundays. This, I believe, is the way to true holiness.
I agree, and also…Its noble to say I want to be Catholic, Sacrements etc. But it also seems many humans rest in their own human nature around this point, which is sinful btw [our nature]. And yes there are Catholics whom I would venture to say may well be Saints and just unknown. And I have met many inspirations in the Catholic Church. But then humility is a quality which I have found most impressive in humans.
I do just as mentioned here, and many of us do. Its a Devotion we don’t seem to view as a thorn in our side. I would much rather contribute 1-hour daily of my time-management to Gods Plan and Will, then to say, “I should have done that”.
There are many here for example who went to confession yesterday for the Reparartion of the First Saturday devotion to Our Lady. And many probly had NO-Sin. They went for Others, who can’t find it in themself to accept Gods will. There are many who come here to put back into the pot, so to speak.
IMHO its impossible to stop all sin, “moral sins” without a doubt one could stop. Venial is a Cross we pretty much carry in life. Myself and many who has sought this goal have found it illusive at times, though not always. You can certainly string periods of time together, which I believe are a Grace from God. Its enough to help you see clearly what can be done, a window if you will.
Is there a man/woman who completely stopped sinning? There’s a point where it dawns on us, that you simply observe someone and must admit they are very good people. At this point we must leave the rest to God. And Incourage them as they inspire us! There are Saints here among us, you can be assured of this.
I could also say this with honestly. I have sinned and lived that life. So I have seen both sides of the story. Even a sinner, need not use the fact that He/She is a sinner to validate their behavior. Thats not acceptable. And many have gone from sinner to great Catholics and even Saints. So there’s no excuse’s.
St Augustine sinned for what 40-years? Apostle Paul? There are so many you can draw strength from if you seriously seek this path. I am very impressed with the Sisters who consecrate their lives to God. Not that the Priests don’t deserve mention. I"m just saying that restrictions on the Sisters is very, very difficult.