Cyril-of-JerusalemSomeone will say: if the Divine substance is incomprehensible, why then do you discourse of these things?

So then, because I cannot drink up all the river, am I not even to take in moderation what is expedient for me?

Because with eyes so constituted as mine I cannot take in all the sun, am I not even to look upon him enough to satisfy my wants?

Or again, because I have entered into a great garden, and cannot eat all the supply of fruits, would you have me go away altogether hungry?

I praise and glorify Him that made us; for it is a divine command which says, Let every breath praise the Lord (Ps. 150:6).

I am attempting now to glorify the Lord, but not to describe Him, knowing nevertheless that I shall fall short of glorifying Him worthily, yet deeming it a work of piety even to attempt it at all.

For the Lord Jesus encourages my weakness, by saying, No man hath seen God at any time (John 1:18).  They are the Evangelist’s own words.

What then, some man will say, is it not written, The little ones’ Angels do always behold the face of My Father which is in heaven (Matt. 18:10)?  Yes, but the Angels see God not as He is, but as far as they themselves are capable.

For it is Jesus Himself who says, Not that any man hath seen the Father, save He which is of God, He hath seen the Father (John 6:46).

The Angels therefore behold as much as they can bear, and Archangels as much as they are able; and Thrones and Dominions more than the former, but yet less than His worthiness.

For with the Son the Holy Ghost alone can rightly behold Him:  for He searcheth all things, and knoweth even the deep things of God  (1 Cor. 2:10);  as indeed the Only-begotten Son also, with the Holy Ghost, knows the Father fully.

For neitherknoweth any man the Father, save the Son, and he to whom the Son will reveal Him   (Matt. 11:27).

For He fully beholds, and, according as each of us can bear, reveals God through the Spirit, since the Only-begotten Son together with the Holy Ghost is a partaker of the Father’s Godhead. He, who  was begotten knows Him who begat; and He Who begat knows Him who is begotten.

Since Angels then are ignorant (for to each according to his own capacity does the Only-begotten [i.e. the Son] reveal Him [the Father] through the Holy Ghost, as we have said), let no man be ashamed to confess his ignorance.

Cyril of Jerusalem (c. 313-386): Catechetical Lectures 6, 5-6.