Testimony on Gregory the Great
Peter the Deacon's eyewitness testimony that the Holy Spirit in the form of a dove sat upon Gregory the Great as he commented and wrote.
Preface and Praise of Sacred Scripture
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Chapter V: On the Dispositions Required for This Study
— Peter the Deacon attested: Holy Spirit in form of a dove sat upon Gregory as he commented and wrote
"That the Holy Spirit sat upon St. Gregory the Great in the form of a dove... as he was commenting and writing, the eyewitness Peter the Deacon attests."