Something that jumped out at me while reading Jane Austen's Persuasion for the Classics Club Challenge was the exploration of intimacy in conversation.
Throughout Persuasion, Anne Elliot and Frederick Wentworth barely speak to each other. When they do, it's pained small talk conducted in public. They have a significant shared history and much to say to each other, but they don't speak. They mostly notice each other, wordlessly. Or they hear about each other through what other people say. But there are social and personal barriers between them.
What they need isn't public conversation anyway. Conversation overheard by other people often comes across as silly, insignificant, or misguided in this book.
Look at Admiral and Sophy Croft, for instance. They're a model for happily married couples, well-matched and walking side-by-side through life (and on-board ship). Their conversations are almost never overheard publicly. You see them spending a lot of time together, heads together, but rarely does the reader hear what they say to each other. (The one significant time a conversation of theirs takes place in front of other people is when Anne briefly shares their curricle - and in that scene, the Admiral's observation about how Frederick should choose one of the Musgrove girls isn't a sensible one.) Their most meaningful exchanges are private, where even the reader can't access them.
So, Anne and Frederick aren't meant to have conversations for public consumption. But how do they get to the place where they can talk privately?
There's the letter at the end. Some say it's Frederick's letter, but really he's writing it in collaboration with Anne, based on what she's telling someone else in the room. It's a joint effort. And it's what brings down the barrier, because a letter is private, wholly, and introduces space for intimate conversation between them at last.
(That letter also makes me think of Anne drawing a bow back, throughout the book. Frederick's the arrow. She slowly brings him to a place where he can fly forward true in his intentions.)