On the Celestial Hierarchy
Treatise on the orders of angels and heavenly intelligences, opening with an exhortation to proceed from Sacred Scripture received from the Fathers.
Preface and Praise of Sacred Scripture
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Chapter II: On the Object and Breadth of Sacred Scripture
— Dionysius quoted from the opening of the Celestial Hierarchy on proceeding from Sacred Scriptures received from the Fathers
"Let us proceed with all our strength to understand the Sacred Scriptures, as we have received them from the Fathers, to be contemplated, and let us speculate, insofar as we can, on the distinctions and orders of the heavenly spirits"