You’re talking about yesterday’s reading? I was thinking about the meaning of this exact passage over the weekend.
In the Sacra Pagina book on Matthew, the author makes the point that selling the man and his family wasn’t about repayment, it was about punishment. (After all, the debt was 10K talents!)
If selling a whole family was insufficient to repay the debt, then, it therefore follows that throwing the man into prison was likewise insufficient. In other words, the implication was that it would be impossible to “pay to the last penny.”
In other words, this isn’t a statement about Purgatory (in which “payment” for temporal punishment is “paid”), but rather, about Hell (in which one is punished eternally).
So… an idea (like Voris’), in which we apply this passage to Purgatory, seems to be off base. (Yes, I realize he’s not the only one who prooftexts that line to make it seem like it’s talking about Purgatory, but the fact remains…)