The lecture attempts to investigate the various theories concerning the multiple and/or single authorship of Isa 40-66. The so-called Servant Songs are also dealt with, alongside with such theological themes, as Zion, city of God, king and Messiah, the Servant and the nations and finally trust in God. Further topics to be discussed include: political planning, prophecies in new settings, Rome, Babylon and the Gospel, prophecy, Jews and Christians. The topic of rhetorical intention in the book of Isaiah as a whole brings the lecture to a closure.