A fundamental difference of opinion exists between the secular, critical view of Tanakh, and the religious view. If a person believes that the Tanakh possesses sanctity and that the prophet receives his messages from God through prophecy and Divine inspiration, then he will obviously regard as illegitimate the view that a prophet is simply an eloquent and insightful member of the general population with no real ability to discern the future. Such a position represents a denial of the whole concept of prophecy, regardless of one's position on the question of whether Sefer Yishayahu is a single work or two separate ones brought together. It was this, then, that caused the great controversy concerning the existence of a second prophet prophesying the prophecies from chapter 40 of Yishyahu and onwards.

Courtesy of the Virtual Beit Midrash, Yeshivat Har Etzion