Namely, the use of the phrase Ayn Sof to describe God the Creator. Literally, it means "no thing."
But the meaning is that no word of men can describe God the Creator, e.g. time, space, form, matter, energy do not apply to the Creator of them.
The insight is that once we mortals attach a word to an object, we limit our awareness of the object to the meaning of that word.
Observe the inscription on the cruciform, "ο ΩΝ". That means "the [only] Existence". The created world exists secondarily. God exists and that is all He does. He is existence itself.
So very true, dear sister in Christ! In so doing, the description of the object increasingly stands in lieu of the reality (object) it describes. Something very similar is going on with sense perception itself. Can we really say to what extent a sense perception is anything more than a registration of the appearance of a thing in a form suitable for mental processing, which can tell us nothing about what the thing really is, as it is in itself?
When God says a Word, He's not "making a description." He is implementing reality itself. Although human beings cannot do this, it seems many post-modernist thinkers believe they can "change the reality" by changing the words with which it is described. For a human to do this must involve belief in a magical act of transformation, in a "magic word," die Zauberworte the speaking of which involves what Heimito von Doderer has called "the refusal to apperceive reality ... [which is] the pathological core in the structure of consciousness that enables the dreamer to ignore rational argument against his construction." [Eric Voegelin, "Wisdom and the Magic of the Extreme," Collected Works, Vol. 12, p. 323]
But magic is never real: It does not deal with reality at all, but only with how human beings are "set-up" to perceive its false facsimile....
Truly, "no word of men can describe God the Creator," since time, space, form, matter, energy are descriptive categories of men which have no relevance to the Creator Himself, Who is the Ayn Sof, the "no thing" which made all these things. He cannot be "measured" in terms of such things.
Thank you ever so much, dearest sister in Christ, for your illuminating essay/post!