Gregory the Dialogist

They were afraid, they answered no more, they removed speech from themselves. The friends of Job are well said to have been afraid of the words of Eliu, since frequently proud defenders of the Church, though they do not observe due order in what they say, yet confound the adversaries by the very virtue of their words.

Morals on the Book of Job, Book XXIII ↗

Thomas Aquinas

He intends to excuse himself in the answer he will give, not only in their eyes, but also in the eyes of others, and therefore, he turns his discourse to others saying, "They have been terrified," to speak further lest they be more clearly convinced, "and they did not answer further," the arguments of Job. He shows that this silence was the result of their laziness, and not due to the effective character of the arguments of Job, saying, "and abstained from speaking by their own will," for they kept silence from negligence. …

Commentary on Job ↗