The heart also of the rash - Margin, ‘Hasty.’ The Hebrew word denotes those who hasten; that is, those who are precipitate in forming a judgment, or deciding on a course of action. They do not take time to deliberate, and consequently they are led headlong into error, and into improper courses of life.
Shall understand knowledge - They shall take time to deliberate; and they shall consequently form a more enlightened judgment.
And the tongue of the stammerers - The ‘stammerers’ (compare the note at Isaiah 28:11) seem here to denote those who had indistinct and confused views of subjects, or who were incapable of expressing clear and intelligible views of divine truth.
Shall be ready to speak plainly - Margin, ‘Elegantly.’ The Hebrew is צתות tsâthôth ‘clear,’ ‘white,’ usually applied to a bright, clear, white light. The sense is, that there should be no indistinctness or obscurity in their views and modes of utterance.