1. How complete this ruin will be, and how necessarily and unavoidably it will follow upon their sins. He had compared this people to a vine (v. 7), well fixed, and which, it was hoped, would be flourishing and fruitful; but the grace of God towards it was received in vain, and then the root became rottenness, being dried up from beneath, and the blossom would of course blow off as dust, as a light and worthless thing, Job xviii. 16. Sin weakens the strength, the root, of a people, so that they are easily rooted up; it defaces the beauty, the blossoms, of a people, and takes away the hopes of fruit. The sin of unfruitfulness is punished with the plague of unfruitfulness. Sinners make themselves as stubble and chaff, combustible matter, proper fuel to the fire of God's wrath, which then of course devours and consumes them, as the fire devours the stubble, and nobody can hinder it, or cares to hinder it. Chaff is consumed, unhelped and unpitied.