As we ascend to that which is more perfect, He who is without form or shape comes no longer without form or without shape. Nor does He cause His light to come to us and be present with us in silence. But how? He comes in a definite form indeed, though it is a divine one. Yet God does not show Himself in a particular pattern or likeness, but in simplicity, and takes the form of an incomprehensible, inaccessible, and formless light. We cannot possibly say or express more than this; still He appears clearly and is consciously known and clearly seen, though He is invisible. He sees and hears invisibly and, just as friend speaks to friend face to face (cf. Ex. 33:11), so He who by nature is God speaks to those whom by grace He has begotten as gods. He loves like a father, and in turn He is fervently loved by His sons.
(Saint Symeon the New Theologian)