Iamblichus
Neoplatonic philosopher from Syria. Wrote on the life and doctrines of Pythagoras, claiming his teaching was divinely handed down.
Works
Preface and Praise of Sacred Scripture
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Chapter V: On the Dispositions Required for This Study
— Says doctrine of Pythagoras, divinely handed down, cannot be understood without a god interpreting
"There is that well-known saying of Iamblichus"