Jack Miles's wonderful literary reading of the Hebrew Bible as a biography of God offers the insight that after the Book of Job, God never speaks again. God may seem to silence Job, but Job silences God. It is lovely that Job silencing God is part of the text (though likely an accidental order of the books), because it reflects a real change in the real world after the Book of Job came into it.
Jennifer Michael Hecht, Doubt: A History: The Great Doubters and Their Legacy of Innovation from Socrates and Jesus to Thomas Jefferson and Emily Dickinson
book-of-job, silence