“If there is hope it lays in the proles”

This quote was repeated five times over two chapters near the end of the book.
The proles are usually referred to as animals and are treated like animals,

“The proles are not human beings,”

But the only way the party can be overthrown is from the proles because they are 85% of the population and if they are motivated they have the power to destroy the government. Even though the proles have purposely been uneducated to not understand what the government is doing they can become aware of what is happening, but they are distracted by the lottery that they their time and money on.

“The lottery, with its weekly pay out of enormous prizes, was the one public event to which the proles paid serious attention. It was probable that there were some millions of proles for whom the lottery was the principal if not the only reason for remaining alive.”

So they are not monitored by the thought police, this means that they can plan and speak with others so they can overthrow the party and create a new fair society. The word “if” shows that there is a very small chance of this happening if there is any at all. Hope also shows this because the proles are the only ones to use emotions and the use of the word hope shows this because it is a very optimistic and expressive word that should not be used by the party because it would be a thought crime or a facecrime.

This quote also shows that Winston can not do anything to stop the government because the proles have to free themselves.