“May God guide our every word and thought, He the only sense of those who think or of the objects of their thought, the sole reason for speakers and their subjects, the life of the living and of those who receive life, who is and will become all to all, for the sake of things present or yet to be; on His own account, He neither is nor will become anything in any sense whatever of all things presently existing or still to come, as His nature is not of the same order at all as the things we say exist. For this reason it could be rather more suitable to say He does not exist, because His mode of existence is so superior. It is very important to perceive the true difference between God and creatures; the mode of existing of the Supreme Being must be denied of existing things; and the mode of existence of existing things is not that of transcendent being; the real meaning of both “existence” and “non-existence” must be considered in relation to the Supreme Being, and then neither can be affirmed. Both can be said validly: the term “existing” is opposite to God as the cause of existence; but the term “existence” as it applies to the transcendent cause of being, is totally to be denied of all creatures. But then, neither term is precisely applicable to God, as neither expresses the really essential mode of existence natural to the essence in question. Nothing existent or non-existent, no existing thing that we know of, or non-existent thing unknown to us, can come reasonably close to that to which nothing at all is linked of its nature as a cause (for He is uncaused, absolutely free and independent). His existence is simple, unknowable, and inaccessible to all, completely inscrutable, beyond description by any of our affirmative or negative language."

from the Mystagogy of St. Maximus the Confessor [Μάξιμος ο Ομολογητής]

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Apophatic theology en.wikipedia.org/wiki/Apophatic_theology orthodoxwiki.org/Apophatic_theology

Maximus the Confessor en.wikipedia.org/wiki/Maximus_the_Confessor

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photo: coutyard of Potlogi Palace Complex St. Demetrius - St. Nicholas Church [finished in 1683] Biserica "Sf. Dumitru", "Sf. Nicolae"