Epistles
Gregory's papal correspondence; letter 84 of Book IV contains the famous rebuke to Theodore the physician for neglecting Scripture, describing it as a letter from God to his creature.
Preface and Praise of Sacred Scripture
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Section One
— Book IV, letter 84 quoted: rebuking Theodore for neglecting Scripture
"The Emperor of heaven, the Lord of angels and men, has sent his letters to you for your life, and you neglect to read them eagerly! For what is Sacred Scripture but a kind of letter from Almighty God to his creature?"