How we cite our quotes: (Part.Letter.Paragraph)
Quote #10
But a letter is a portrait of the heart, and, unlike a picture, it has not that fixity which is so alien to love; it reflects all our emotions: it is in turn lively, joyful, at rest… (4.150.6)
This is Danceny writing to the Marquise, begging her to write to him. He's saying that that letters are very self-disclosing. He obviously doesn't know who he's dealing with, poor kid.