H. P. Grice: There are, of course, all sorts of other maxims (acsthetic, social, or moral in character), such as 'Be polite', that are also normally observed by participants in talk exchanges, and these may also generate nonconventional implicatures. The conversational maxims, however, and the conversational implicatures connected with them, are specially connected (I hope) with the particular purposes that talk (and so, talk exchange) is adapted to serve and is primarily employed to serve.

 There are, of course, all sorts of other maxims (acsthetic, social, or moral in character), such as 'Be polite', that are also normally observed by participants in talk exchanges, and these may also generate nonconventional implicatures. The conversational maxims, however, and the conversational implicatures connected with them, are specially connected (I hope) with the particular purposes that talk (and so, talk exchange) is adapted to serve and is primarily employed to serve.