Theodore (holy monk)
Holy monk recorded by Cassian who was so unlettered that he did not even know the alphabet, yet so skilled in divine volumes that the most learned consulted him. He taught that effort must go to uprooting vices rather than perusing books.
Preface and Praise of Sacred Scripture
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Chapter V: On the Dispositions Required for This Study
— So unlettered he didn't know the alphabet, yet so skilled in Scripture the most learned consulted him
"Cassian records that Theodore, a holy monk, so unlettered that he did not even know the alphabet"