John Chrysostom
But here, verse 14, the knowledge is not equal. Where, then, is it equal? In the Father and in Me. Here He says: "As the Father knows Me, even so I know the Father."
If He had not wished to show this, why would He have added those words? Since He often ranks Himself among men, someone might think that His knowledge is like human knowledge. Therefore He added: "As the Father knows Me, even so I know the Father."
I know Him as perfectly as He knows Me. Therefore He also said: "No one knows the Son except the Father, and no one knows the Father except the Son"; Mt 11:27. He meant a certain special knowledge, such as no one else can possess.
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"And I lay down My life." He repeats this often to show that He is not a deceiver. So also the Apostle, when he wished to show himself a true teacher and directed his speech against false apostles, boasted of afflictions and deaths.
He said: "In stripes beyond measure, in deaths often"; 2 Cor 11:23. The expressions "I am the light" and "I am the life" seemed arrogant to the senseless. But the words "I wish to die" stirred up neither envy nor hatred.
Therefore they do not say to Him: "You bear witness of Yourself; Your witness is not true." Those words showed His great care, since He wished to give Himself up for men who were casting stones at Him.
What knowledge more perfect than this do you desire? Ask the one who objects: does the Father know the Son perfectly, and does He possess exact knowledge of everything concerning Him, so that nothing concerning the Son is hidden from Him, but full knowledge belongs to Him?
He will say, Yes. Therefore, when you hear that the Son also knows the Father as the Father knows the Son, seek nothing further, since Their knowledge is entirely equal.
He expresses the same thing elsewhere, saying: "No one knows the Son except the Father, and no one knows the Father except the Son, and he to whom the Son wills to reveal Him"; Mt 11:27.