Life of Saint Ambrose
The deacon Paulinus's biography of Ambrose of Milan, recording that Ambrose was seen assisted by an angel while treating Scripture.
Preface and Praise of Sacred Scripture
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Chapter V: On the Dispositions Required for This Study
— Paulinus cited: Ambrose was seen assisted by an angel while treating Scripture
"Ambrose, if we believe St. Paulinus in his account of his deeds, when he was treating the Scriptures in a sermon, was seen assisted by an angel."