Isaiah 32:20 - Matthew Poole's English Annotations on the Holy Bible

Blessed are ye that sow: as the barren forest shall be destroyed with hail, Isaiah 32:19, so the fruitful field shall be improved, and bring forth much fruit; which is signified by a declaration of the blessedness of them that sow in it. Beside all waters; in all moist and fat grounds, which are like to yield good fruit. But this passage, as well as others in the foregoing verses, is to be understood mystically, and seems to respect the times of the gospel. The prophet reflecting upon his own unsuccessful labours, of which he complains, Isaiah 49:4, and elsewhere, and foreseeing by, the Spirit the great and happy success of his successors, the ministers of the gospel, tacitly bewails his own unhappiness, who sowed his seed upon dry and barren ground, by congratulating the happiness of the apostles, who sowed their seed more generally, upon all fit grounds, without any distinction between Jews and Gentiles; and who found the ground, to wit, the hearts of the people, more moistened and softened, and better prepared to receive the good seed of God's word. The ox and the ass; which creatures they employed in ploughing and sowing the ground, Deuteronomy 22:10 Psalms 144:14 Isaiah 30:24.