to enter into a disputation, an opening that suggests the start of a new literary unit. Having said that ch. 40 functions in an introductory way, one must immediately qualify that statement. One should not think that the chapter introduces all the major themes of even chs. 41–48, let alone chs. 41–55 or chs. 41–66. Three major themes that are not touched on are witness, the Servant, and the salvation of the nations.13 Thus the chapter does not provide a summary of what follows but rather sets the