The endless meaning of life, power, and history.
In this quote Winston explains why he is different from this peers. He explains that he knows about what the party is doing and why they are doing it. Because of that, Winston rebels and tries to gain freedom. Until the rest of the citizens know about what the party is doing they will not rebel.
"Who controls the past controls the future: who controls the present controls the past." Book 3 Chapter 2
Winston states this quote numerous times. The party controls the past, so they control the future. The party also controls the present, as well as the past.