Therefore, I don not understand your statement that "the doctrine of Purgatory in no way suggests that all are eventually saved." What would be the purpose of purification of a soul in the Purgatory unless that soul was not destined to be with God?
Agrarian was talking about St. Gregory's error in thinking that all, even Satan, are eventually saved, and I responded that the doctrine of Purgatory is exactly as you understand it, as purification of those of the saved that require it, but not of the damned, and not of those who reached purification in the course of their life, such as the saints, or the Good Thief.
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I wasn't aware that St. Gregory thaught that. That is a grave error indeed.