Isaiah 28:21, 23-29 – God’s Alien Work--Measured Judgment
SummaryGod will do God's "alien" work--judgment of God's own people--but will do it in a manner that is carefully measured so that Judah is finally saved rather than being "pulverized."
On Perazim (2 Samuel 5:17-21) and at Gibeon (Joshua 10:10) God did what the people hoped and prayed for: fought against the enemies of Judah. But now God will do something unexpected--something "strange" and "alien"--namely, fight against Jerusalem (29:1-3).
In commenting on this verse (28:21), Martin Luther made a sharp distinction between God's "proper" work of grace and God's "alien" work of judgment. But because God is wise and good, God's judgment, too, is for our benefit: "But when our flesh is so evil that it cannot be saved by God's proper work, it is necessary for it to be saved by His alien work"--that is, God must destroy our ungodliness in order that we might be saved (Luther's Works, vol. 16, pp. 233-234).
In 28:23-29, Isaiah uses a parable from the wisdom tradition to note how carefully God works, even in judgment. God does not destroy wantonly or for its own sake, but like a farmer, only so that the crop might flourish. The farmer does not plow (tear up the earth) continually, but only in order to plant. Like the farmer, God does not thresh to pulverize the grain, but only to free the seeds and grain so that it might provide nourishment. Thus, again, God's "alien" work of judgment (metaphorically, plowing and threshing) is done in the service of God's "proper" work of saving (metaphorically, planting and harvesting).