In Isaiah 40-66, the prophet(s) built on the theological paradigms of Isaiah ben Amoz (Isaiah 1-39).
Isaiah's greatness lies not only in his ethical teachings, but in his central involvement--and prophetic intervention--in the political events of his day.
Joel vividly portrays the dependence of human life upon God's favor.
Tradition connects the prophet's vision to the revelation at Sinai.
An interpretation of this reading explains why Israel received God's revelation.