Angels in the roles of teachers become especially important in Jewish apocalyptic literature, in such books as Daniel, Zechariah, and 4 Ezra, which feature enigmatic and terrifying prophetic visions experienced by unknowing humans who need heavenly guidance to understand what they have witnessed; no longer does prophecy come with full or immediate understanding. Rather, a type of commentary or explanation of the vision is provided through the figure of an interpreting angel, whose teachings dispel the ignorance of the prophet and allow him to better understand, and thus better propagate, the knowledge of the end times that his vision contains.