Tradition
St. John Chrysostom
Homilies on the Gospel of John
Homily 70 › John 13:7
“He says unto him, What I do you know not now, but you shall know here after.”
That is “you shall know how great is the gain from this, the profit of the lesson, and how it is able to guide us into all humblemindedness.” What then does Peter? He still hinders Him, and says,
Source: Homilies on the Gospel of John (New Advent)