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"I am ashamed to say it," I returned, "and yet it's no worse to say it than to think it. You call me a lucky fellow. Of course, I am. I was a blacksmith's boy but yesterday; I am—what shall I say I am—to-day?" (30.26)
Just like today, most of the people in Pip's life derive their identity from the job that they do. Pip wants to be a gentleman who derives his identity from what he is rather than what he does—but he's not there yet. He can still only dream about it.
While my mind was thus engaged, I thought of the beautiful young Estella, proud and refined, coming towards me, and I thought with absolute abhorrence of the contrast between the jail and her. (33.4)
We're not so sure that Estella and the jail have so little in common. They're both associated with death, and they're both locked up tight. One is a dream and one is a nightmare, but other than that—yep, pretty similar.
"It is a part of Miss Havisham's plans for me, Pip," said Estella, with a sigh, as if she were tired; "I am to write to her constantly and see her regularly, and report how I go on—I and the jewels—for they're nearly all mine now." (33.58)
Miss Havisham may claim that she never planned to ruin Estella's life, but it sure seems like she tried to. Check out the way Estella and the jewels seems to be one and the same.