Why do we remember the words, allegedly spoken by O'Brien in 1984, about meeting: "In the place where there is no darkness".
As readers and consumers of language in novels or plays, we often remember words that either contain foreshadowing or a pun. We remember these because of their double-meaning. This is part of reading that makes it challenging, rewarding and dare I say it, even fun.
This phrase, "the place where there is no darkness" is a typical reference to complete light. That light could be like heaven or complete removal of all oppression. See how I used two meanings for the word light? One is location, one is a feeling. This place of no darkness to which O'Brien refers makes Winston think of a world free from the bondage of the Party. The truth becomes that this place of no darkness is actually the place wherein the light of hope is physically removed from people who still contain it. Then, the idea of the Party actually becomes the light, the good. And Winston makes his complete transformation as ultimately seeing it as good in the very end.
I think that we are supposed to remember these words because they represent Winston's dream of what could have happened.
Winston trusts O'Brien largely because of this dream. He is convinced that O'Brien is the one who said they would meet in this place. He is also convinced that this place will be a hopeful place -- a better future.
This is very ironic and sad because Winston is totally misunderstanding what is really going to happen. When he meets O'Brien again in the place with no darkness, it is the prison and O'Brien is there to torture him.