Season 6, Episode 8 - "How Do You Solve a Problem Like Sophia?"
Back from Sister Agnes' funeral, Dorothy worries that Sophia isn't dealing well with the death of her best friend because she's been silent since they left the cemetery. What does Sophia eventually announce to The Girls?
She's becoming a nun just like Sister Agnes.
Dorothy: Ma, this is ridiculous! You don't want to be a nun.
Sophia: Yes, I do, Dorothy. God reminded me today that I've always had a dream, a very private dream, one I never talked about. When I was growing up, I wanted to join the convent. Well, until I was 17.
Rose: What happened then?
Sophia: [Directed at Dorothy] Your father put his hand in my blouse.
Blanche: So?
Sophia: So, I felt soiled, filthy, dirty...you know, in love. But this time I'm going to fulfill my destiny. This time, I'm going to become a nun!
Dorothy: Do you believe what we just heard?
Blanche: I can't believe anybody would want to be a nun. I mean, nun - the word says it.
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