30:12-17 When God is against a people, who will be for them? Who can be for them, so as to do them any kindness? Incurable griefs are owing to incurable lusts. Yet, though the captives suffered justly, and could not help themselves, the Lord intended to appear for them, and to punish their oppressors; and he will still do so. But every effort to heal ourselves must prove fruitless, so long as we neglect the heavenly Advocate and sanctifying Spirit. The dealings of His grace with every true convert, and every returning backslider, are the same in effect as his proceedings to the Jews.

15. Why criest thou—as if God's severity was excessive. Thou hast no reason to complain, for thine affliction is just. Thy cry is too late, for the time of repentance and mercy is past [Calvin].