Are you saying what about people who go through this life refusing God's grace and insist on setting their hearts against God? That's their choice. God's grace is in abundance if they should choose to request it one day.
Do you have a Saint in mind? I'd have to study that Saint. The Saint I recall that was given a vision of hell was that it was reptilian--a very small place to be. Off hand, I don't recall her talking about purgatory. Were the Saints you are thinking of using fire as an allegory? (Fire would hurt our physical bodies, but I am unclear how fire can hurt someone with no body, only spirit.)
I'll repost what I said in post#157 about St. Catherine of Genoa and St Catherine of Ricci:
St. Catherine of Genoa, who is said to have suffered the pain of purgatory on earth, claimed “there is in purgatory as much pain as in hell” (
Treatise on Purgatory). Like the damned, souls there suffer hunger for the God they don’t yet see—like a man who could live without eating, hungering more and more for the bread he doesn’t have (to use St. Catherine’s image). And they suffer from fire that “will be more painful than anything man can suffer in the present life” (St. Augustine
, On Psalm 37:3).
Once St. Catherine of Ricci is said to have suffered 40 days for a soul in Purgatory—when a novice touched her hand, she remarked, “Mother, you are burning!”
At the same time, St. Catherine of Genoa also taught, “Souls in purgatory unite great joy with great suffering … No peace is comparable to that of the souls in purgatory, except that of the saints in heaven.”
There’s a mysterious ebb and flow of pain and joy in Purgatory, says the Dominican Fr. Reginald Garrigou-Lagrange, because the suffering is
temporary and
leads to heaven: The more the soul loves God, the more it suffers not seeing Him; the more if suffers, the more joy and love it has in drawing closer to God.
The saints tell us what Purgatory is actually like