the Works of Dionysius the Areopagite - On Divine Names - Chapter 01 - Section 5

5. But if It is greater than all Reason and all knowledge, and hath Its firm abode altogether beyond Mind and Being, and circumscribes, compacts, embraces and anticipates all things while Itself is altogether beyond the grasp of them all, and cannot be reached by any perception, imagination, conjecture, name, discourse, apprehension, or understanding, how then is our Discourse concerning the Divine Names to be accomplished, since we see that the Super-Essential Godhead is unutterable and nameless? Now, as we said when setting forth our Outlines of Divinity, the One, the Unknowable, the Super-Essential, the Absolute Good (I mean the Trinal Unity of Persons possessing the same Deity and Goodness), ‘tis impossible to describe or to conceive in Its ultimate Nature; nay, even the angelical communions of the heavenly Powers Therewith which we describe as either Impulsions or Derivations from the Unknowable and blinding Goodness are themselves beyond utterance and knowledge, and belong to none but those angels who, in a manner beyond angelic knowledge, have been counted worthy thereof. And godlike Minds, angelically entering (according to their powers) unto such states of union and being deified and united, through the ceasing of their natural activities, unto the Light Which surpasseth Deity, can find no more fitting method to celebrate its praises than to deny It every manner of Attribute. For by a true and supernatural illumination from their blessed union Therewith, they learn that It is the Cause of all things and yet Itself is nothing, because It super-essentially transcends them all. Thus, as for the Super-Essence of the Supreme Godhead (if we would define the Transcendence of its Transcendent Goodness) it is not lawful to any lover of that Truth which is above all truth to celebrate It as Reason or Power or Mind or Life or Being, but rather as most utterly surpassing all condition, movement, life, imagination, conjecture, name, discourse, thought, conception, being, rest, dwelling, union, limit, infinity, everything that exists. And yet since, as the Subsistence of goodness, It, by the very fact of Its existence, is the Cause of all things, in celebrating the bountiful Providence of the Supreme Godhead we must draw upon the whole creation. For It is both the central Force of all things, and also their final Purpose, and is Itself before them all, and they all subsist in It; and through the fact of Its existence the world is brought into being and maintained; and It is that which all things desire—those which have intuitive or discursive Reason seeking It through knowledge, the next rank of beings through perception, and the rest through vital movement, or the property of mere existence belonging to their state. Conscious of this, the Sacred Writers celebrate It by every Name while yet they call It Nameless.

Dionysius the Areopagite: On the Divine Names and the Mystical Theology. by C.E. Rolt Christian Classics Ethereal Library