It is my opinion that our intellect does not have a natural power to be
moved to the divine vision of Divinity. And in this one deficiency we
are the peers of all the celestial natures, for both in us and in them
grace moves that which is alien by nature both to the human intellect
and to the angelic. For divine vision concerning the Godhead is not to
be numbered among the other kinds of divine vision. For we possess
divine vision of the natures of things through participation in their
twofold nature, because there is a portion of all things in us. But we
do not have a portion of the nature of the Divine Essence, and so
neither do we have by nature divine vision of it.
The Ascetical Homilies of St. Isaac the Syrian.