Pseudo-Dionysius The Areopagite said this quote

Unknowing, or agnosia, is not ignorance or absence of knowledge as ordinarily understood, but rather the realization that no finite knowledge can fully know the Infinite One, and that therefore He is only truly to be approached by agnosia, or by that which is beyond and above knowledge.

~ Pseudo-Dionysius The Areopagite

WE say then- that the Cause of all, which is above all, is neither without being, nor without life----nor with- out reason, nor without mind, nor is a body----nor has shape----nor form----nor quality, or quantity, or bulk----nor is in a place----nor is seen----nor has sensible contact----nor perceives, nor is perceived, by the senses----nor has disorder and confusion, as being vexed by earthly passions,----nor is powerless, as being subject to casualties of sense,----nor is in need of light;----neither is It, nor has It, change, or decay, or division, or deprivation, or flux,----or any other of the objects of sense.

~ Pseudo-Dionysius The Areopagite

TRIAD supernal, both super-God and super-good, Guardian of the Theosophy of Christian men, direct us aright to the super-unknown and super-brilliant and highest summit of the mystic Oracles, where the simple and absolute a!nd changeless mysteries of theology lie hidden within the super-luminous gloom of the silence, revealing hidden things, which in its deepest darkness shines above the most super-brilliant, and in the altogether impalpable and invisible, fills to overflowing the eyeless minds with glories of surpassing beauty. This then be my prayer; but thou, O dear Timothy, by thy persistent commerce with the mystic visions, leave behind both sensible perceptions and intellectual efforts, and all objects of sense and intelligence, and all things not being and being, and be raised aloft unknowingly to the union, as far' as attainable, with Him Who is above every essence and knowledge. For by the resistless and absolute ecstasy in all purity, from thyself and all, thou wilt be carried on high, to the superessential ray of the Divine darkness, when thou hast cast away all, and become free from all.

~ Pseudo-Dionysius The Areopagite