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"We are not interested in those stupid crimes that you have committed. The Party is not interested in the overt act: the thought is all we care about. We do not merely destroy our enemies, we change them. Do you understand what I mean by that?" (3.2.99, O’Brien)
The Party ultimately vaporizes captured rebels, but not before converting and reindoctrinating them, through means of torture.
"Do it to Julia! Do it to Julia! Not me! Julia! I don't care what you do to her. Tear her face off, strip her to the bones. Not me! Julia! Not me!" (3.5.24)
Faced with his biggest fear, Winston finally betrays his private loyalty to Julia.
"I betrayed you," she said baldly.
"I betrayed you," he said.
She gave him another quick look of dislike.
"Sometimes," she said, "they threaten you with something you can't stand up to, can't even think about. And then you say, ‘Don't do it to me, do it to somebody else, do it to So-and-so.’ And perhaps you might pretend, afterwards, that it was only a trick and that you just said it to make them stop and didn't really mean it. But that isn't true. At the time when it happens you do mean it. You think there's no other way of saving yourself, and you're quite ready to save yourself that way. You want it to happen to the other person. You don't give a damn what they suffer. All you care about is yourself."
"All you care about is yourself," he echoed.
"And after that, you don't feel the same towards the other person any longer."
"No," he said, "you don't feel the same." (3.6.16-22, Winston and Julia)
For both Winston and Julia, torture is able to chew through the deepest bonds of loyalty.