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My sister's bringing up had made me sensitive. In the little world in which children have their existence whosoever brings them up, there's nothing so finely perceived and so finely felt, as injustice. It may be only small injustice that the child can be exposed to; but the child is small, and its world is small, and its rocking-horse stands as many hands high, according to scale, as a big-boned Irish hunter. (8.95)
Pip's world may contained, small, and familiar, but, it's terrorized by his angry sister. We're pretty sure that being conscious of injustice means that you're not innocent any longer.
With which he took them out, and gave them, not to Miss Havisham, but to me. I am afraid I was ashamed of the dear good fellow—I know I was ashamed of him—when I saw that Estella stood at the back of Miss Havisham's chair, and that her eyes laughed mischievously. (13.18)
As any kid can tell you, realizing that your parents are embarrassing is definitely the end of one kind of innocence.
Finally, I remember that when I got into my little bedroom I was truly wretched, and had a strong conviction on me that I should never like Joe's trade. I had liked it once, but once was not now. (13.69)
Satis House is no Garden of Eden, and Estella gave Pip bread and water instead of the fruit of knowledge, but he definitely feels like he's been cast out of something.