6 And then, turning again to those who preach, and gather in and govern the congregations of His people, and so open as they can to Christ, but are afraid, amid the difficulties of such work, of falling into sin, she says, “I have washed my feet; how shall I defile them?” For whosoever offends not in word, the same is a perfect man. And who, then, is perfect? Who is there that offends not amid such an abounding of iniquity, and such a freezing of charity? “I have washed my feet; how shall I defile them?”
At times I read and hear: “My brethren, be not many masters, seeing that you shall receive the greater condemnation: for in many things we offend all.” “I have washed my feet; how shall I defile them?” But see, I rise and open. Christ, wash them. “Forgive us our debts,” because our love is not altogether extinguished: for “we also forgive our debtors.” When we listen to You, the bones which have been humbled rejoice with You in the heavenly places. But when we preach You, we have to tread the ground in order to open to You: and then, if we are blameworthy, we are troubled; if we are commended, we become inflated.
Wash our feet, that were formerly cleansed, but have again been defiled in our walking through the earth to open unto You. Let this be enough today, beloved. But in whatever we have happened to offend, by saying otherwise than we ought, or have been unduly elated by your commendations, entreat that our feet may be washed, and may your prayers find acceptance with God.
Source: Tractates on the Gospel of John (New Advent)