Not that any man has seen the Father, except he who is of God, he has seen the Father.
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Cyril of Alexandria
AD 444
Having foreseen as God, that they would no wise receive the revelation through the Spirit, nor would take in the Wisdom from above in its illuminations, but would reject out of much ill-advisedness the very duty of seeing the Father and (so to say) of being instructed by very Vision of God, which as they supposed was once the case with their fathers, when the glory of God came down upon the mount Sinai: He first draws them back, and turns them as with a bridle to the duty of not having a gross conception of God, and of not supposing that the Invisible Nature will ever be visible: for no one (saith He) hath seen the Father at any time. But probably He was hinting at the hierophant Moses: for the Jews, in this also thinking very foolishly, supposed on account of his entering the thick darkness, that he saw the Ineffable Nature of God, and beheld with the bodily eyes, that which is by Nature the Untaint Beauty. But lest by saying anything more openly respecting the all-wise Moses, He should seem to be urging them to their wonted state of mind, He says indefinitely of all alike, and as of him, Not that any man hath seen the Father. Do not (says He) demand what is above nature, nor be ye borne in senseless course to that which is unattainable by all things that are made. For the Divine and Incomprehensible Nature hath retired and is withdrawn not from our eyes only, but also from those of the whole creation: for in the word No one, He comprehendeth all things, and in declaring that He Alone is of God, and hath seen the Father, He putteth Himself outside of all, whereof the 'no one' may be understood declarative. But since He is apart from all, and while none hath seen the Father, He Alone misseth not the seeing Him, how shall He not henceforth be conceived of, not among all, as one of them, but external to all, as above all? And if, whereas all things are said to be of God, and none seeth the Father (for all things are of God, as Paul saith), He Alone seeth the Father because He is of God: deeming aright we shall understand the words Of God, to be of the Essence of the Father, in respect of Him Alone. For if it be not so, why, as we said before, since all things are said to be of God, doth He Alone attain unto the Sight of Him That begat Him because He is of God? Wherefore it will be less accurately said of created things (for all things are of God by creation in that they are brought into being by Him): but of the Son, in another and truer sense will His being of God, be demonstrated, as being of Him by Nature. Wherefore He, not numbered among the all, but being external to all, and above all with the Father, will not share the infirmity of all, in that He is excepted from affinity with them, but mounting up unto the Nature of Him that begat Him, will surely see Him from Whom He is.
But how or in what manner, either He beholds the Father, or is seen of the Father, it pertains not to our tongue to say: we must nevertheless conceive of it in a God-befitting manner,