Although there was in these words a flavor of that sentimental emotion at her own lofty feelings, and that new mystical fervor which had lately gained ground in Petersburg, and which seemed to Alexey Alexandrovitch disproportionate, still it was pleasant to him to hear this now.
There are no more uses of "mystic" in the book.
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She is a mystic who believes enlightenment will come from communing with nature.
She is a mystic who claims to be able to both talk to the dead and see into the future.