On the Pythagorean Life
Iamblichus's account of Pythagoras's life and teachings, cited for the maxim that divine doctrine requires a divine interpreter.
Preface and Praise of Sacred Scripture
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Chapter V: On the Dispositions Required for This Study
— Iamblichus cited: Pythagoras's doctrine, being divine, cannot be understood without a god interpreting it
"There is that well-known saying of Iamblichus: that the doctrine of Pythagoras, because it was divinely handed down... could not be understood except with some god interpreting it"