(1.) That when God had done his work by him he would then do his work upon him, v. 12. For the comfort of the people of God in reference to Sennacherib's invasion, though it was a dismal time with them, let them know, [1.] That God designed to do good to Zion and Jerusalem by this providence. There is a work to be done upon them, which God intends, and which he will perform. Note, When God lets loose the enemies of his church and people, and suffers them for a time to prevail, it is in order to the performing of some great good work upon them; and, when that is done, then, and not till then, he will work deliverance for them. When God brings his people into trouble it is to try them (Dan. xi. 35), to bring sin to their remembrance and humble them for it, and to awaken them to a sense of their duty, to teach them to pray and to love and help one another; and this must be the fruit, even the taking away of sin, ch. xxvii. 9. When these points are, in some measure, gained by the affliction, it shall be removed, in mercy (Lev. xxvi. 41, 42), otherwise not; for, as the word, so the rod shall accomplish that for which God sends it. [2.] That when God had wrought this work of grace for his people he would work a work of wrath and vengeance upon their invaders: I will punish the fruit of the stout heart of the king of Assyria. His big words are here said to come from his stout heart, and they are the fruit of it; for out of the abundance of the heart the mouth speaks. Notice is taken too of the glory of his high looks, for a proud look is the indication of a proud spirit. The enemies of the church are commonly very high and haughty; but, sooner or later, God will reckon for their haughtiness. He glories in it as an incontestable proof of his power and sovereignty that he looks upon proud men and abases them, Job xl. 11, &c.