'Then where does the past exist, if at all?'

'In records. It is written down.'

'In records. And----?'

'In the mind. In human memories.'

'In memory. Very well, then. We, the Party, control all records, and we
control all memories. Then we control the past, do we not?'

'But how can you stop people remembering things?' cried Winston again
momentarily forgetting the dial. 'It is involuntary. It is outside oneself.
How can you control memory? You have not controlled mine!'

O'Brien's manner grew stern again. He laid his hand on the dial.

'On the contrary,' he said, 'YOU have not controlled it. That is what has
brought you here. You are here because you have failed in humility, in
self-discipline. You would not make the act of submission which is the
price of sanity. You preferred to be a lunatic, a minority of one. Only the
disciplined mind can see reality, Winston. You believe that reality is
something objective, external, existing in its own right. You also believe
that the nature of reality is self-evident. When you delude yourself into
thinking that you see something, you assume that everyone else sees the
same thing as you. But I tell you, Winston, that reality is not external.
Reality exists in the human mind, and nowhere else. Not in the individual
mind, which can make mistakes, and in any case soon perishes: only in the
mind of the Party, which is collective and immortal. Whatever the Party
holds to be the truth, is truth. It is impossible to see reality except by
looking through the eyes of the Party. That is the fact that you have got
to relearn, Winston. It needs an act of self-destruction, an effort of the
will. You must humble yourself before you can become sane.'