The letter 'was couched in' polite terms.
a psychiatrist's 'couch'
(..) feelings flying around? Why, does that make you uncomfortable? - No, no, no. - No? No, no, no. No, I'm not on your couch. Well, you know what Freud said about the Irish? Yeah, I do. Yeah, if you actually do, I'll see you again. (..)2006 The Departed