For a plenary indulgence you need the following:
Prayer for the Pope’s intention
Without any attachment to sin, even venial, according to some sources.
It’s the last one I’m wondering about. Is it possible that no one can know for sure whether they have an attachment to sin? It may be the case that very few people are without an attachment to sin…it seems like a lofty statement. Anyone have any thoughts or examples of what does or does not qualify?