A reader writes:
1.) Will souls in purgatory be purged at the end of the world? If so,
what will happen to the souls on earth that would need to go to
purgatory to be cleansed?
This one we have a pretty clear answer on. Speaking of the end of the world, St. Paul says:
Lo! I tell you a mystery. We shall not all sleep [i.e., we won't all die before the end of the world], but we shall all be changed, in a moment, in the twinkling of an eye, at the last trumpet. For the trumpet will sound, and the dead will be raised imperishable, and we shall be changed. For this perishable nature must put on the imperishable, and this mortal nature must put on immortality [1 Cor. 15:51-53].
So anybody who is still alive at the end, or who is still in purgatory when the resurrection happens, will have whatever purification they need taken care of in an instant, "in the twinkling of an eye."
What we don’t know is whether purgatory takes place that fast now. It may or it may not. We don’t know a lot about how time works in the afterlife. (Though since God is outside of time, he can apply your prayers to whenever a person was in purgatory, even if he is "already" out.)
What amazes me is when anti-Catholics throw out the question of what will happen to people in need of purification at the end of the world who don’t have "time" for purgatory as if it were some kind of objection to the doctrine. I always want to respond, "What? God doesn’t have enough omnipotence to clean someone up fast?"
2.) Is it possible that those in purgatory are angels on earth helping us out, or are angels beings of their own?
It’s not impossible that God may have folks in purgatory do things to help us here on earth. If doing so would further their purification, he might well assign them posthumous chores to do. But they would not be angels. Angels are a different order of being than humans. Thus the Compendium states:
60. Who are the angels?
The angels are purely spiritual creatures, incorporeal, invisible, immortal, and personal beings endowed with intelligence and will. They ceaselessly contemplate God face-to-face and they glorify him. They serve him and are his messengers in the accomplishment of his saving mission to all.
Angels are thus different than humans, who are not purely spiritual beings, but embodied spiritual beings (i.e., whose natural condition is to be in a body, which is why we get resurrected at the end of time).

