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Remember little Jacinta of Fatima, who went to great lengths to do penance "for the Holy Father, who will have much to suffer."
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It's up for grabs as to just WHAT that suffering would be, as she never really got into that. Nor did she name the Holy Father.
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But Our Lady gave her to know that the Holy Father's suffering would be great, and that by us offering voluntary acts of expiation for the Holy Father, it would somehow reduce his suffering.
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Looking back at what she may have meant, I find it hard to imagine any suffering greater than that suffered by the damned in hell.
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