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"[…] see how I am going on. Dissatisfied, and uncomfortable, and—what would it signify to me, being coarse and common, if nobody had told me so!" (17.33)
Pip seems to associate ignorance with innocence—but that's probably not going to work as an excuse when you don't want to study for your econ test.
I put my light out, and crept into bed; and it was an uneasy bed now, and I never slept the old sound sleep in it any more. (18.132)
All of a sudden, Pip is thinking about the "future": he has dreams desires, goals, and complex emotions. It sounds like part of losing your innocence is becoming aware of the passage of time.
There was something so natural and winning in Clara's resigned way of looking at these stores in detail, as Herbert pointed them out,—and something so confiding, loving, and innocent, in her modest manner of yielding herself to Herbert's embracing arm—and something so gentle in her, so much needing protection on Mill Pond Bank, by Chinks's Basin, and the Old Green Copper Rope-Walk, with Old Barley growling in the beam—that I would not have undone the engagement between her and Herbert, for all the money in the pocket-book I had never opened. (46.20)
Aw. Herbert and Clara have a cute little innocent love, kind of like high school sweethearts. Pip and Estella are more like Ike and Tina.