De Magistro
Augustine's dialogue on language, signs, and Christ as the interior teacher, demonstrating that Christ alone is the true teacher of wisdom.
Preface and Praise of Sacred Scripture
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Chapter V: On the Dispositions Required for This Study
— Cited: Augustine teaches that Christ alone is the true teacher
"St. Augustine wrote a book On the Teacher, in which he teaches that this saying of Christ is most true: "One is your teacher, Christ," and in I Retractations, chapter 4, he retracts what he had said elsewhere, that there are many roads to truth, since there is only one, namely Christ, the way, the truth, and the life."