Good point, thanks 
. I’d say they are more rare than common, but maybe my life just isn’t strange enough 
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In any case: When you have xenolalia, can you transcribe them with the correct different apostrophes or whatever these '` are called? So correctly that AIs recognise the language? I’ve never heard of that. Maybe in automatic writing with a pen? Still sounds… very unusual 
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It’s hard to imagine a random parasite being able to do that. It’s even harder to imagine that any spirit is able to give such a quote to someone who otherwise can’t hear him at all.
Hence my idea that the quote must come from one of the mediums. And there I agree with Mulberry’s points .
We don’t know if the spirit the medium perceives is the one Callie perceives… If I was Callie, I think I’d try to reason only from my own personal experience. What can I hear, what do I feel?
Edit:
From a psychic medium and from Marbas when I asked what spirit/Demon who was coming to my bed each night
The other thread starts with explaining that the message comes from a medium – I had just missed it . So that question is answered, but yeah, the other points remain.