don't know what they are consciously remembering and what is told to them. "The party had invented airplanes" (Orwell 127) is just one example of the party's propaganda and false statements that change every day. The other reason for the diary is so that people in the future will be able to read what went on during Winston's time and to tell them about his daily reflections on his feelings about the party. These are the same reasons why Orwell wrote 1984. He wanted to expose a communist country (the Soviet Union).
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