Commentary on John
Then when he says, I know him, he teaches us how to know him from whom he is. For if a thing is to be learned, it must be learned from one who knows it. But only the Son knows the Father. And so he says: If you wish to know him who sent me, you must acquire this knowledge from me, because I alone know him. First, he shows that he knows him; secondly, he shows the perfection of his knowledge; and thirdly, the nature of his knowledge.
He shows that he knows him when he says, I know him. Now it is true that "All men see him" (Jb 36:25), but they do not see him in the same way, for in this life we see him through the intermediary of creatures: "The invisible things of God are clearly known through the things that have been made" (Rom 1:20). Thus we read: "Now we see in a mirror, in an obscure manner" (1 Cor 13:12). But the angels and the blessed in heaven see him through his essence: "Their angels in heaven always see the face of my Father who is in heaven" (Mt 18:10); "We shall see him as he is" (1 Jn 3:2). The Son of God, on the other hand, sees him in a more excellent way than all, that is, with a comprehensive or all-inclusive vision: "No one has ever seen God," i.e., in a comprehensive way; "it is the Only Begotten Son, who is in the bosom of the Father, who has made him known" (above 1:18); "No one knows the Father but the Son" (Mt 11:27). It is of this vision that he is speaking of here, when he says: I know him, with a comprehensive knowledge.
He shows the perfection of his knowledge when he says: And if I were to say that I do not know him, I would be like you, a liar. This is mentioned for two reasons. Intellectual creatures do know God, though from a distance and imperfectly, for "All men see him, from a distance" (Jb 36:25). For divine truth transcends all our knowledge: "God is greater than our hearts" (1 Jn 3:20). Therefore, whoever knows God can say without lying: "I do not know him," because he does not know him to the full extent that he is knowable. But the Son knows God the Father most perfectly, just as he knows himself most perfectly. Thus he cannot say: I do not know him.
Again, because our knowledge of God, especially that which comes through grace, can be lost—"They forgot God, who saved them" (Ps 105:21)—men can say, I do not know him, as long as they are in this present life: because no one knows whether he deserves love or hatred. The Son, on the other hand, has a knowledge of the Father that cannot be lost; so he cannot say: I do not know him.
We should understand, I would be like you, as a reverse likeness. For they would not be lying if they said they did not know God; but they would be if they said that they did know him, since they did not know him. But if Christ said that he did not know him, he would be lying, since he did know him. So the meaning of this statement is this: If I were to say that I do not know him, then since I really do know him, I would be like you, a liar, who say that you know him, although you do not.
Could not Christ have said: I do not know him? It seems he could, since he could have moved his lips and said the words. And so he could have lied. I reply that Christ did say this and still was not lying. We should explain it this way: If he were to say, I do not know him, declaratively, meaning, "I believe in my heart what I profess by my lips," then he would have been a liar. Now to say as the truth what is false comes from two defects: from a defect of knowledge in the intellect; and Christ could not have this since he is the wisdom of God (1 Cor 1:30); or it could come from a defect of right will in the affections; and this could not be in Christ either since he is the power of God, according to the same text. Thus he could not say the words I do not know him, declaratively. Yet this entire conditional statement is not false, although both its parts are impossible.
The reason for this singular and perfect knowledge of Christ is given when he says: I do know him, because I am from him, and he sent me. Now all knowledge comes about through some likeness, since nothing is known except insofar as there is a likeness of the known in the knower. But whatever proceeds from something has a likeness to that from which it proceeds; and so, all who truly know have a varied knowledge of God according to the different degrees of their procession from him. The rational soul has a knowledge of God insofar as it participates in a likeness to him in a more imperfect way than other intellectual creatures. An angel, because it has a more explicit likeness to God, being a stamp of resemblance, knows God more clearly. But the Son has the most perfect likeness to the Father, since he has the same essence and power as he does; and so he knows him most perfectly, as was said. And so he says: But I do know him, that is, to the extent that he is knowable. And the reason for this is because I am from him, having the same essence with him through consubstantiality. Thus, just as he knows himself perfectly through his essence, so I do know him perfectly through the same essence. And so that we do not understand these words as referring to his being sent into this world, he at once adds, and he sent me. Consequently, the statement, I am from him, refers to his eternal generation, through which he is consubstantial with the Father. But then when he says, and he sent me, he is saying that the Father is the author of the incarnation: "God sent his Son, made from a woman, made under the law" (Gal 4:4). Now just as the Son has a perfect knowledge of the Father because he is from the Father, so because the soul of Christ is united to the Word in a unique way, it has a unique and more excellent knowledge of God than other creatures, although it does not comprehend him. And so Christ can say, according to his human nature: I know him in a more excellent way than other creatures do, but without comprehending him.
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