While researching to answer another Jude the Obscure question, I found a list of homework assignments related to this novel, in which the following one caught my eye:
Three times objects are burned -- Jude’s portrait, his ecclesiastical books, and Sue’s embroidered nightgown. There are additional references to “burning” love or kisses, to the Martyrs’ burning place, and to the burning of the body. Considering that fire both consumes and purifies, discuss the significance of these.
I read it some years ago and I don't remember noticing "burning" as a recurring theme. Is it really a significant theme in the novel, or has someone just found a word that appears a few times, without special significance, to make an assignment?