The point that prophetic imagination must ponder is that there is no freedom of God without the politics of justice and compassion, and there is no politics of justice and compassion without a religion of the freedom of God.
The program of Moses is not the freeing of a little band of slaves as an escape from the empire, though that is important enough, especially if you happen to be in that little band. Rather, his work is nothing less than an assault on the consciousness of the empire, aimed at nothing less than the dismantling of the empire both in its social practices and in its mythic pretensions. Note the significance of Martin Luther King Jr.'s leadership in integrating a lunch counter or a local bus line! Israel emerged not by Moses' hand--although not without Moses' hand--as a genuine alternative community. The prophetic tradition knows that it bears a genuine alternative to a theology of God's enslavement and a sociology of human enslavement. That genuine alternative, entrusted to us who bear that calling, is rooted not in social theory or in righteous indignation or in altruism but in the genuine alternative that Yahweh is. Yahweh makes possible and requires an alternative theology and an alternative sociology. Prophecy begins in discerning how genuinely alternative he is.
-Walter Brueggemann, The Prophetic Imagination, pgs. 8-9