28:23-29 The husbandman applies to his calling with pains and prudence, in all the works of it according to their nature. Thus the Lord, who has given men this wisdom, is wonderful in counsel, and excellent in his working. As the occasion requires, he threatens, corrects, spares, shows mercy, or executes vengeance. Afflictions are God's threshing instruments, to loosen us from the world, to part between us and our chaff, and to prepare us for use. God will proportion them to our strength; they shall be no heavier than there is need. When his end is answered, the trials and sufferings of his people shall cease; his wheat shall be gathered into the garner, but the chaff shall be burned with unquenchable fire.
23. Calling attention to the following illustration from husbandry (Ps 49:1, 2). As the husbandman does his different kinds of work, each in its right time and due proportion, so God adapts His measures to the varying exigencies of the several cases: now mercy, now judgments; now punishing sooner, now later (an answer to the scoff that His judgments, being put off so long, would never come at all, Isa 5:19); His object being not to destroy His people any more than the farmer's object in threshing is to destroy his crop; this vindicates God's "strange work" (Isa 28:21) in punishing His people. Compare the same image, Jer 24:6; Ho 2:23; Mt 3:12.