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Consists of prophecies delivered (Isa. 1) in the reign of Uzziah (1-5), (2) of Jotham (6), (3) Ahaz (7-14:28), (4) the first half of Hezekiah's reign (14:28-35), (5) the second half of Hezekiah's reign (36-66). Thus, counting from the fourth year before Uzziah's death (B.C. 762) to the last year of Hezekiah (B.C. 698), Isaiah's ministry extended over a period of sixty-four years. He may, however, have survived Hezekiah, and may have perished in the way indicated above.

Besides this, the internal evidence, the similarity in the language and style, in the thoughts and images and rhetorical ornaments, all points to the same conclusion; and its local colouring and allusions show that it is obviously of Palestinian origin. The theory therefore of a double authorship of the book, much less of a manifold authorship, cannot be maintained. The book, with all the diversity of its contents, is one, and is, we believe, the production of the great prophet whose name it bears.