" We may still ask in what sense Revelation belongs to the genre of ancient religious literature we call the apocalypse. J. J. Collins defines the literary genre apocalypse in this way: ‘Apocalypse’ is a genre of revelatory literature with a narrative framework, in which a revelation is mediated by an otherworldly being to a human recipient, disclosing a transcendent reality which is both temporal, insofar as it envisages eschatological salvation, and spatial, insofar as it involves another, supernatural world.2 The reference to eschatological salvation would be disputed in some recent study of the apocalypses. Although the apocalypses have conventionally been thought to be about history and eschatology, this is not necessarily true of all of them. The heavenly secrets revealed to the seer in the extant Jewish apocalypses cover a rather wide range of topics and are not exclusively concerned with history and eschatology.3 John’s apocalypse, however, is exclusively concerned with eschatology: with eschatological judgment and salvation, and with the impact of these on the present situation in which he writes. "

― Richard Bauckham , Theology of the Book of Revelation