"Brahman is different from the known, that is to say, from the tangible world of name and form, because It is the Eye of the eye, and so on. All tangible objects can be known somehow, by someone, and to some extent. Brahman is quite different from such objects.
Lest the disciple should misunderstand the statement of the teacher and conclude that Brahman is altogether unknown, the preceptor says that It is above the unknown. The word unknown means the unmanifested avidyā, which is the seed of the gross universe.
By describing Brahman as both distinct from the known and above the unknown, the text indicates that Brahman is Atman, or the inmost Self of the knower; for none other than one’s own Atman can be distinct from both the known and the unknown.”
~Nikhilananda on Kena 1.4