There was a scene in a book, I think it was a russian novel, where a man was describing an encounter he had. Well, it wasn't really an encounter. Go with me here.
A man, not the main character, is recounting a memory he had of seeing a woman standing on a boat. I think she was wearing a white dress. The woman never even saw the man, nothing important happened, but the man said it changed his life and he never went for a month without thinking about the girl on the boat.
Was it Resurrection by Leo Tolstoy? This isn't really something I can Google. The scene itself was very short and not all that instrumental to the plot, so Sparknotes, etc, probably won't help me, either.