But Dora’s aunts soon agreed to regard my aunt as an eccentric and somewhat masculine lady, with a strong understanding; and although my aunt occasionally ruffled the feathers of Dora’s aunts, by expressing heretical opinions on various points of ceremony, she loved me too well not to sacrifice some of her little peculiarities to the general harmony.
There are no more uses of "heresy" in the book.
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It is a hardline form of Sunni Islam that condemns all other strains as heresy.
Before the separation of Church and State, an accusation of heresy could be treated as treason.