How does the "who controls the past" quote show people in Oceania struggling for control of the past?

The full
quote is as follows: "Who controls the past, controls the future: who controls the present
controls the past."

In your question you ask how the quote shows the
people of Oceania struggling to control the past. I actually don't think it does and I don't
think the pages around it do either.

The quote argues that the government's
control of what people believe about the present allows it to control both the past and the
future.  But no one other thanseems to be fighting back against the lies and even he is only
doing it in his own mind.

We know that Winston remembers facts that don't
match up with the official histories, but we don't see anyone else struggling like he
does.