Thought from Today's Old Testament Passage:
This circle of prophecy ends with a message which describes the process toward ultimate restoration, and announces its certainty. The way to restoration is the way of judgment, and this the prophet first announces in figurative language.
The first issue of judgment will be restoration of God's chosen people, and the prophet refers to this under the figure of the vineyard. This figure stands in striking contrast to that in chapter five. The vineyard of the Lord of hosts is now seen as kept by Him, and watered every moment, and the plant of His choice is seen filling the world with fruit. The process of such restoration is judgment, and the prophet declares this in the next section of the message. A ruined vineyard is always the result of failure, and on such failure the Lord can have no compassion.
The last note is hope, the broken and scattered people are to be brought back at the sound of the trumpet, and are to realize their highest vocation, that is, worshiping Jehovah in their holy mountain at Jerusalem.
G. Campbell Morgan, An Exposition of the Whole Bible (Fleming H. Revell Company, 1959), p. 307.