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"It would have been cruel in Miss Havisham, horribly cruel, to practise on the susceptibility of a poor boy, and to torture me through all these years with a vain hope and an idle pursuit, if she had reflected on the gravity of what she did. But I think she did not. I think that in the endurance of her own trial, she forgot mine, Estella." (44.43)
Over and over again, we see hopes and dreams turning people selfish and destructive. But Pip still chooses to believe that humans are innately good, and just derailed by misguided dreams.