One way some who believe OSAS, try to rationalize how some people get “saved” only to later “fall away”, is to claim that person “was never really saved in the first place”. I’ve never really been convinced by this reasoning.
However, there is another approach which seems to make a little more sense. That yes, a “saved” soul can never lose that salvation, but that those who commit many sins after being “saved” will not be rewarded in Heaven, as much as those who are more faithful.
The Jesus quote “My Father’s house has many rooms” is often used to support this idea. So, if a “saved” person commits some kind of horrible sin, such as murder, rape, etc., that person would still go to Heaven, but wouldn’t get to go into the innermost “rooms” close to God, but essentially would be in the equivalent of God’s doghouse for Eternity – but at least he isn’t condemned to Hell.
Now, I realize Catholics do NOT hold to OSAS at all. (Neither do I.) But, I recall Dante’s Inferno has all this imagery of different levels of heaven and hell, but AFAIK he was a poet, not a theologian. Do Catholics believe this, though? Or, is this what Purgatory is for, so that those who just barely qualify to make it to Heaven, are purified, and then once that’s done, the soul is ready to enjoy all of Heaven?
I have also heard that Catholics believe certain “crowns” will be granted in Heaven to those with certain merits; such as the Crown of Virginity or Chastity, or the Crown of Martyrdom. I’ve heard that St. Maximillian Kolbe had a dream in which he was offered either the Crown of Virginity or the Crown of Martyrdom. St. Kolbe asked for both, and he did indeed receive them, and died both a virgin and a martyr. Are their other “crowns” that will be granted to those who meet certain requirements? (I must confess, I am imagining something like Boy Scout badges here, but I assume the “crown” is meant to be more of a metaphor.)