John Chrysostom
What then does Peter do? He continues to resist and says, “You shall never wash my feet.”
What are you doing, Peter? Do you not remember the former words? Was it not you who said, “Be merciful to Yourself, Lord,” and heard, “Get behind Me, Satan” (Mt 16:22-23)?
Did even this not instruct you, and are you still heated? Yes, he says, but now the action being done is extraordinary and astonishing.
Since Peter acted this way out of great love, Christ again catches him by that love. As then He strongly rebuked him, saying, “You are a stumbling block to Me,” so now He says, “If I do not wash you, you have no part with Me.”
But why did Christ not say why He was doing this, and instead used a threat? Because Peter would not have listened.
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If He had said, “Allow it; through this I wish to teach you humility,” Peter would have promised a thousand times to be humble, if only the Master would not do this.
But what does He say now? He says what Peter feared and dreaded most: being separated from Him.
For Peter often asked, “Where are You going?” and on this very occasion said, “I will lay down my life for You” (Jn 13:36-37).
If he did not yield even when he heard, “You do not know now what I am doing, but afterward you will understand,” then still less would he have yielded if he had known.
For this reason He spoke as He did, knowing that if Peter understood this then, he would continue to resist.
Peter did not say, “Explain it to me, and I will not resist.” Rather, as a sign of still greater fervor, he did not even wish to know it, but again insisted on his own way, saying, “You shall never wash my feet.”
But when Christ used the threat, he immediately became quiet.