Isaiah 32:4 (BSB)

The mind of the rash will know and understand, and the stammering tongue will speak clearly and fluently.

From Isaiah 32. Also in the ESV.

Commentary on Isaiah 32:4

• Matthew Henry (Presbyterian), Matthew Henry's Complete Commentary on Isaiah 32:1-8: We have here the description of a flourishing kingdom. "Blessed art thou, O land! when it is thus with thee, when kings, princes, and people, are in their places such as they should be." It may be taken as a directory both to magistrates and subjects, what both ought to do, or as a panegyric to Hezekiah, who ruled well and saw something of the...
• John Gill (Reformed Baptist), Exposition of the Old and New Testaments on Isaiah 32:4: The heart also of the rash shall understand knowledge,.... Such who have been hasty and precipitant, as the word (c) signifies; who have not given themselves time to consider what they have read or heard, or has been proposed unto them, and have hastily received every thing that has been suggested to them, especially by carnal sense and reason, shall now sit down, and coolly...
• Jamieson-Fausset-Brown (Reformed), Commentary Critical and Explanatory on the Whole Bible on Isaiah 32:4: rash--rather, "the hasty"; contrast "shall not make haste" (Isa 28:16); the reckless who will not take time to weigh religious truth aright. Or else, the well-instructed [HORSLEY]. stammers--those who speak confusedly on divine things (compare Exo 4:10-12; Jer 1:6; Mat 10:19-20).
• Keil & Delitzsch (Lutheran), Biblical Commentary on the Old Testament on Isaiah 32:3-4: Isa 32:3-4 The second is an opened understanding, following upon the ban of hardening. “And the eyes of the seeing no more are closed, and the ears of the hearing attend. And the heart of the hurried understands to know, and the tongue of stammerers speaks clear things with readiness.” It is not physical miracles that are predicted here, but a spiritual change.