Topic > and with exegetical analysis.Critical IssuesTwo significant critical debates in the study of the book of Isaiah, the debate between the deutero Isaiah and the unified Isaiah. And the History vs. debate Prophecy those debates question scholars about the authorship of the book, those who believe that “the Prophet in chaps. 40–55. Unlike other prophetic books, Isaiah chap. 40–55 do not have introductory titles such as “The Vision of Isaiah the Son of Amoz,” “this debate began when” some 18th-century biblical critics questioned the unity of the Book of Isaiah. Towards the end of the 19th century a theory emerged attributing chapters 40-66 to an unknown prophet, a deutero ("second") Isaiah, who supposedly lived among the exiles in Babylon..