The old feeling, that at bottom it did not matter whether O’Brien was a friend or an enemy, had come back. O’Brien was a person who could be talked to…O’Brien had tortured him to the edge of lunacy, and in a little while, it was certain, he would send him to his death. It made no difference.

George Orwell

1984. Part 3, Chapter 2. Winston’s feelings after torture by O’Brien.