“From the proletarians nothing is to be feared. Left to themselves, they will continue from generation to generation and from century to century, working, breeding, and dying, not only without any impulse to rebel, but without the power of grasping that the world could be other than it is.”
Quick Write: In this quote I believe this quote says proles don't mind living the life they are stuck with. They have this fixed mindset of not caring to change the party or this society in 1984. The Party isn't worried about the proles rebelling because the Party is more worried about the upperclass.