Therefore doth Job open his mouth in vain; he multiplieth words without knowledge. Therefore doth Job open his mouth in vain - God will execute vengeance when it may best serve the ends of his justice, providence, and mercy. The delay of judgment is not proof that it shall not be executed; nor is the deferring of mercy any proof that God has forgotten to be gracious.
He multiplieth words without knowledge - However this may apply to Job, it most certainly applies very strongly and generally to the words, not only of Job's three friends, but to those also of Elihu himself. The contest is frequently a strife of words.
Commentary on the Bible, by Adam Clarke [1831].