The Bell Jar by Sylvia Plath:
I was pretty sure the Catholics wouldn’t take in any crazy nuns. My Aunt Libby’s husband had made a joke once, about a nun that a nunnery sent to Teresa for a checkup. This nun kept hearing harp notes in her ears and a voice saying over and over, “Alleluia!” Only she wasn’t sure, on being closely questioned, whether the voice was saying Alleluia or Arizona. The nun had been born in Arizona. I think she ended up in some asylum.