Shortly before their arrest at the end of part II, Winston and Julia are standing side by side in the room above Mr. Charrington's shop, looking down at the prole washerwoman who is always singing and hanging laundry in the courtyard below. As he watches the washerwoman and muses that Party members don't sing that way anymore, Winston thinks that the hope for the future lies with the proles.
The proles are superior to Party members, according to Winston, because the traditional way of life they lead stretches back a thousand years and has never been interfered with: marriage, children, work, and an endless physicality that passes down a way of life based on family and labor. Winston imagines people like the washerwoman spread across the earth. Their society is superior to his, he muses, because it is based on equality and therefore is sane.
In addition, people feel affection and loyalty to one another. Prole children don't spy on parents and turn them in for unorthodoxy. Proles aren't spied on by view screens. The proles, Winston thinks, will survive as they are a thousand years into the future, and when the time comes, rise up and rebel against the oppression of the regime. They have a "vitality," Winston believes, that it is impossible for the Party to kill.