So, in my way of thinking, after Baptism, when all ones sins are washed away, we partake of the Sacrament of Reconciliation to maintain that state of grace. Of course, that grace is heightened through prayer, Mass attendance, Rosaries, works of mercy, etc. etc.
And if a person sins grievously, then we must partake of the Sacrament of Reconciliation again. Yes, it is a lifelong and ongoing effort in which we must persevere.
Even St. Paul in speaking of the goal of salvation spoke of running the race and continually recommitting to the loving of the Lord, Jesus Christ.
So, where am I wrong and being a proponent of heresy? (Which, BTW, I do not think I am.)
The Church teaches that they, too, can attain salvation.