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He obeyed the Party, but he still hated the Party. In the old days he had hidden a heretical mind beneath an appearance of conformity. Now he had retreated a step further: in the mind he had surrendered, but he had hoped to keep the inner heart inviolate. He knew that he was in the wrong, but he preferred to be in the wrong. (3.4.24)
Even after months of torture, Winston outwardly obeys the Party, but inwardly does not resign his rebellious spirit.