Conferences
Cassian's record of conversations with Egyptian desert monks on the spiritual life, including the story of Theodore the unlettered monk who was skilled in Scripture.
Preface and Praise of Sacred Scripture
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Chapter V: On the Dispositions Required for This Study
— Cassian cited: Theodore the monk, unlettered but skilled in Scripture
"Cassian records that Theodore, a holy monk, so unlettered that he did not even know the alphabet, yet so skilled in the divine volumes"