Dialogues
Gregory's accounts of the lives and miracles of Italian saints, especially Benedict of Nursia, including the famous vision of the whole world in a single ray of light.
Preface and Praise of Sacred Scripture
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Chapter V: On the Dispositions Required for This Study
— Book II, chapter 35 cited: Benedict's vision of the whole world in a single ray of light
"St. Gregory reports, II Dialogues, chapter 35, that the Blessed Benedict, praying one evening at a window, saw a light so great that it surpassed the day and put all darkness to flight, and in this light, he says, the whole world, as if gathered under a single ray of sunlight, was brought before his eyes"