The book is a compilation of the visions that Isaiah received from the Lord. He presented this revelation as messages and compiled them into their present form. His disciples may have put finishing touches on the collection under divine inspiration. Most of the book is poetic in form, the prophet having been lifted up in his spirit as he beheld and recorded what God revealed to him. Much of the content is eschatological and therefore prophetic, though most of the ministry of the prophets, including Isaiah, was forth telling rather than foretelling. Much of what is eschatological is also apocalyptic, dealing with the final climax of history in the future. These portions bear the marks of that type of literature: symbols, analogies, and various figures of speech.18
Students of Isaiah have difficulty understanding the eschatological portions of the book. Some believe that we should look for a literal fulfillment of everything predicted. Others believe that when Isaiah spoke of Israel and Jerusalem he was referring to the church. More literal interpretation results in a premillennial understanding of prophecy whereas spiritualization results in an amillennial or postmillennial understanding. The problem with taking every prophecy literally is that in many places the prophet used metaphors and other figures of speech to describe his meaning; what he wrote does not describe exactly what he meant. The problem with spiritualizing all the prophecies is that the New Testament teaches that Israel will have a future in God's plans as Israel (Rom. 11:26-27). The church will not replace Israel though the church does participate in some of the blessing promised to Israel. The most satisfying position, for me, is to interpret Isaiah as literally as seems legitimate in view of other divine revelation while at the same time remembering that some of what appears to be literal description may in fact be metaphorical. This is the approach taken by most premillennialists.
"Surely God may be expected to have one basic meaning in what he says. This is true, but just as human speech, especially when it is poetical, may suggest further levels of significance beyond the meaning conveyed by the passage in its context, so may the Word of God."19
