I have understood that one makes an ongoing journey closer and closer to God. It has been my understanding that this journey that this journey is for eternity.
The only problem I have with this definition is that it makes eternity into a temporal measure, which seems contrary to its actual meaning (no-time). If eternity “goes on forever”, then it’s not truly outside of time, but just the endless measure of time. This seems to contradict the traditional meaning and use of the term, and it also means that there was a measure of time that God existed “before” He made the world, which raises a whole host of theological problems (such as the fact that you can’t have a moment that comes after another without ultimately having a “first moment”, since every moment follows on a previous one; this would mean that God “had to start sometime”, or else He never would have existed at all).
In short, if there is a “before” and “after” in eternity, then by definition it’s not actually eternity. If there is a moment when you can say “I’m closer to God now than I was before”, you’re not in eternity.
The reference to St. Maximos the Confessor supporting the notion of Purgatory is likely this one:
“This purification does not concern those who have arrived at a perfect love of God, but those who have not reached complete perfection, and whose virtues are mixed in with sins. These latter will appear before the tribunal of judgment, and, following an examination of their good and evil actions, they will be tried as by fire; their bad works will be expiated by a just fear and pain” (Questions and Doubts on The Church, the Liturgy, and the Soul of Man, question 10; A.D. 649).
There may be more quotes from him, or this one might be spurious or out-of-context; I’ve not read this quote firsthand in the original source, but only seen it in apologetics on the topic.
Taken as-is, though, it’s a pretty obvious reference to Purgation, and even to the passage from St. Paul about our works being tested by fire that Latins often use (and Byzantines often criticize as a misrepresentation of Scripture).
Incidently, I’ve heard that St. Basil’s homilies on Isaiah also contain some pretty explicit references to cleansing fire as a kind of penance or medicinal punishment for those who are Saved".
Peace and God bless!