Tractates on the Gospel of John

⁷ A little before He said, “My judgment is true; because I am not alone, but I and the Father that sent me:” as if He said, The reason why my judgment is true is, because I am the Son of God, because I speak the truth, because I am truth itself. Those men, understanding Him carnally, said, “Where is your Father?” Now hear, O Arian: “You neither know me, nor my Father;” because, “If you knew me, you would know my Father also.” What does this mean, except “I and the Father are one”?

When you see some person like some other—give heed, beloved, it is a common remark; let not that appear to you difficult which you see to be customary,— when, I say, you see some person like another, and you know the person to whom he is like, you say in wonder, “How like this person is to that!” You would not say this unless there were two. Here one who does not know the person to whom you say the other is like remarks, “Is he so like him?” And you answer him: What, do you not know that person?

Says he, “No, I do not.” Immediately thou, in order to make known to him the person whom he does not know by means of the person whom he observes before him, answerest, saying, Having seen this man, you have seen the other. You did not, surely, assert that they are one person in saying this, or that they are not two; but made such answer because of the likeness: “If you know the one, you know the other; for they are very like, and there is no difference whatever between them.” Hence also the Lord says, “If you knew me, you would know my Father also;” not that the Son is the Father but like the Father.

Let the Arian blush. Thanks be to the Lord that even the Arian is separate from the Sabellian error, and is not a Patripassian: he does not affirm that the Father assumed flesh and came to men, that the Father suffered, rose again, and somehow ascended to Himself; this he does not affirm; he acknowledges with me the Father to be Father, the Son to be Son. But, O brother, you have escaped that shipwreck, why go to the other? Father is Father, Son is Son; why do you affirm that the Son is unlike, that He is different, another substance? If He were unlike, would He say to His disciples, “He that has seen me has seen the Father”? Would He say to the Jews, “If you knew me, you would know my Father also”? How would this be true, unless that other was also true, “I and the Father are one”?