John Chrysostom
Here he expresses his wonder that He who is so great and so exalted, who came from God and goes to God, who holds all things in His power, did this. Despite all His greatness, He did not disdain to take such a work upon Himself.
By “giving over,” as it seems to me, he means here the salvation of the faithful. Christ means the same giving over when He says, “All things have been delivered to Me by My Father” (Mt 11:27).
So also He says elsewhere, “They were Yours, and You gave them to Me” (Jn 17:6). And again, “No one can come to Me unless the Father draws him” (Jn 6:44). And, “unless it has been given him from heaven” (Jn 3:27).
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Thus this expression either means this, or it means that the washing of the feet could in no way abase Him. For He came from God, goes to God, and holds all things.
When you hear of “giving over,” suppose nothing human. This only shows reverence toward the Father and unity of mind with Him.
For as the Father gives over to Him, so He also gives over to the Father. Paul shows this when he says, “when He delivers the Kingdom to God the Father” (1 Cor 15:24).
He speaks here in human terms, showing His great care for the disciples and revealing His ineffable love for them. For He now cared for them as His own.
He taught them the mother of all good things, humility, which He called the beginning and end of virtue.
The words, “He had come from God and was going to God,” are not added without reason. They were added so that we might know that He acted worthily of the One who came from there and goes there, trampling down every pride.