Job 33:31

Mark well, O Job, hearken unto me; i.e. "Mark well what I say. Note it, and lay it up in thy heart." Hold thy peace, and I will speak. It may be conjectured that Job at this point showed some inclination to break silence and answer Elihu.

But Elihu thought that he had a great deal more to say, which was of importance, and wished not to be interrupted. He therefore checked Job's utterance. Then, fearing lest he had gone too far, he made the concession of the next verse.