The standard definition of apocalyptic literature comes from J.J. Collins (The Apocalyptic Imagination [New York: Crossroad, 1989], p. 4.):
An apocalypse is defined as: ‘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’.
The three central apocalyptic texts which have been used to define the genre include: