Then said Jesus unto them,
When you have lifted up the Son of man, then shall you know that I am he, and that I do nothing of myself; but as my Father has taught me, I speak these things.
All Commentaries on John 8:28 Go To John 8
Augustine of Hippo
AD 430
When our Lord said, He is true that sent Me, the Jews did not understand that He spoke to them of the Father. But He saw some there, who, He knew, would believe on Him after His passion. Then said Jesus to them, When you have lifted up the Son of man, then you shall know that I am. Recollect the words, I am that I am, and you will know why I say, I am. I passover your knowledge, in order that I may fulfill My passion. In your appointed time you will know who I am; when you have lifted up the Son of man. He means the lifting up of the cross; for He was lifted up on the cross, when He hung thereon. This was to be accomplished by the hands of those who should afterwards believe, whom He is now speaking to; with what intent, but that no one, however great his wickedness and consciousness of guilt might despair, seeing even the murderers of our Lord forgiven.
Or thus: Having said, Then shall you know that I am, and in this, I am, implied the whole Trinity: lest the Sabellian error should creep in, He immediately adds, And I do nothing of Myself; as if to say, I am not of Myself; the Son is God from the Father. Let not what follows, as the Father has taught Me, I speak these things, suggest a carnal thought to any of you. Do not place as it were two men before your eyes, a Father speaking to his son, as you do when you speak to your sons. For what words could be spoken to the only Word? If the Father speaks in your hearts without sound, how does he speak to the Son? The Father speaks to the Son incorporeally, because He begat the Son incorporeally: not did He teach Him, as having begotten Him untaught; rather the teaching Him, was the begetting Him knowing. For if the nature of truth be simple, to be, in the Son, is the same as to know. As then the Father gave the Son existence by begetting, so He gave Him knowledge also.
And though both are together, yet one is sent, the other sends. For the mission is the incarnation; and the incarnation is of the Son only, not of the Father. He says then, He that sent Me, meaning, By whose Fatherly authority I am made incarnate. The Father however, though He sent the Son, did not withdraw from Him, as He proceeds to say: The Father has not left Me alone. For it could not be that where He sent the Son, there the Father was not, He who says, If in heaven and earth. And He adds the reason why He did not leave Him: For I do always those things that please Him; always, i.e. not from any particular beginning, but without beginning and without end. For the generation from the Father has no beginning in time.
