Saint Gregory's Commentary on Job, or Moralia, sive Expositio in Job, sometimes called Magna Moralia (not to be confused with Aristotle's Magna Moralia), was written between 578 and 595, begun when Gregory was at the court of Tiberius II at Constantinople, but finished only after he had already been in Rome for several years. It is Gregory's major work, filling some 35 books or 6 volumes, a commentary on the Book of Job entitled "An Extensive Consideration of Moral Questions".

Saint Gregory's Commentary on Job, or Moralia, sive Expositio in Job, sometimes called Magna Moralia (not to be confused with Aristotle's Magna Moralia), was written between 578 and 595, begun when Gregory was at the court of Tiberius II at Constantinople, but finished only after he had already been in Rome for several years. It is Gregory's major work, filling some 35 books or 6 volumes, a commentary on the Book of Job entitled "An Extensive Consideration of Moral Questions".