John Cassian
Monk and ascetic writer who founded monasteries at Marseilles. His writings on monastic life and spiritual practices were influential in Western monasticism.
Preface and Praise of Sacred Scripture
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Chapter V: On the Dispositions Required for This Study
— Records Theodore, a holy monk so unlettered he didn't know the alphabet, yet so skilled in divine volumes that he was consulted by the most learned; said effort must go to uprooting vices rather than perusing books
"Cassian records that Theodore, a holy monk"