28:27 A threshing instrument - This then was made like a sledge shod with iron, which was drawn by men or beasts, over the sheafs of corn, to bruise them, and tear the grain out of them. A wheel - A lower wheel than a cart wheel, but of the same form, upon which possibly the threshing instrument was drawn.
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.