Moralia in Job
Gregory's massive moral and allegorical commentary on the Book of Job, containing his famous image of Scripture as a river both shallow and deep.
Preface and Praise of Sacred Scripture
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Chapter II: On the Object and Breadth of Sacred Scripture
— Book 18, chapter 14 quoted: silver's veins as Sacred Scripture
"Silver," he says, "is the brightness of speech or of wisdom; the veins are Sacred Scripture, as if to say plainly: He who prepares himself for the words of true preaching must draw the origins of his arguments from the sacred pages; so that he may trace back everything he says to the foundation of divine authority, and build the edifice of his speech firmly upon it."
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Chapter V: On the Dispositions Required for This Study
— Preface, chapter 41 quoted: Scripture is a river shallow and deep
"The divine discourse of sacred Scripture," he says, "is a river both shallow and deep, in which the lamb may walk and the elephant may swim."
Commentary on the Pentateuch of Moses
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Canons Bearing a Torch Before the Pentateuch
— Cited (preface to Book 1) for the view that divine apparitions were made through angels
"Gregory in the preface to the Morals, Book 1"