Yet you have not known him; but I know him: and if I should say, I know him not, I shall be a liar like unto you: but I know him, and keep his saying.
All Commentaries on John 8:55 Go To John 8
Cyril of Alexandria
AD 444
But I know Him and keep His Word.
As far as belongs to the first contact of the words before us, we say this, that Christ is speaking again as man and abasing Himself to our level, not rejecting at its proper time servant-befitting guise. He says therefore that He knows the Father and keeps His word. And we do not surely say that He of necessity witnesses these things to Himself nor yet that He is recounting ought of what pertains to Him, but there is much art mixed up herein. For through His saying that He knows the Father and keeps His word, He shews that the Jews mind the contrary to the things which He affirms that He has, in that they neither know God, nor yet think that they ought to keep His word: for then would they have received with all zeal Him that was foreheralded through Moses and the Prophets. And we shall find among ourselves too some such fashion of speech, goodly and most excellent, having the force of rebuke and gently intimating to some the evils wherein they are, but cutting off their anger at being reproved. For instance let there be a man religious and otherwise good, who reproaching the thief and the drunkard says, I am a religious person, I have not stolen what is another's, nor yet have I ever been drunk. And such an one is not surely bearing witness to himself by this, nor shall we suppose that he is thus speaking, but he is putting the reverse of his own acquirements on those whom he is reproaching. Thus therefore our Lord Jesus Christ too says that He knows the Father and keeps His word, in reverse wise hereby putting about the unholy Jews, that they neither know God nor yet endure His word, or deem worthy of any observance at all the Law prescribed them from above.
But if we must in another way too apply to what is before us and look more subtilly at what is covertly intimated, we shall say this besides, The Son knows His own Father, not having knowledge of such kind as is in us, but Godbefitting and inexplicable. For as man that is begotten of man, not as though learning from any other but from whence himself is, is not ignorant of the nature of him who begat him; so the Son too from whence He is knows His own Father and preserves His word, i. e., has the definition of His Essence preserved whole in Himself, for λόγος means definition. For the λόγος of a man, i. e., the definition of his essence, is, a living creature rational, mortal, recipient of mind and knowledge: the λόγος for example of an angel will be the definition of his being. But of God by Nature we may not receive count or definition, for we know not what He is by Nature, but the Son knoweth His own Father and Begotten of His Essence knoweth what He is by Nature Who begat Him; and taking of our usage and serving Himself of human words, He says that He retains in Himself the Father's word, as though the definition of His Essence: for He is the Image of Him That begat Him and the Impress in no wise charged with unlikeness but having in Himself all the God-befitting Excellencies of Him Who begat Him.