Isaiah 32:4 - Matthew Poole's English Annotations on the Holy Bible

The rash; who were hasty and heady in judging of things; which is an argument of ignorance and folly. Shall understand knowledge; shall become more knowing and considerate in their judgments and actions. The stammerers; that used to speak of the things of God darkly, and doubtfully, and unwillingly. As men's understandings shall then be enlightened, so their speech shall be reformed; which though it was in part fulfilled in Hezekiah; this reformation being effected in some measure by his counsel and example, and by the powerful preaching of the Levites, whom he excited and encouraged to teach the good knowledge of the Lord, as is said, 2 Chronicles 30:22; yet was truly and fully accomplished only by Christ, who wrought this wonderful change in an innumerable company both of Jews and Gentiles.