On the Ecclesiastical Hierarchy · Pseudo-Dionysius the Areopagite
PdEH 6.2.1
And the renunciation of the divided, not only lives, but even imaginations, shews the most perfect love of wisdom in the Monks, which exercises itself in science of the unifying commandments. For it is, as I said, not of the middle Rank of the initiated, but of the higher than all.