Augustine of Hippo — as excerpted in the Catena Aurea on John 13:12-20

“(Tr. lviii. 4) This act is done literally by many1, when they receive one another in hospitality. For it is unquestionably better that it should be done with the hands, and that the Christian disdain not to do what Christ did. For when the body is bent at the feet of a brother, the feeling of humility is made to rise in the heart, or, if it be there already, is confirmed. But besides this moral meaning, is not a brother able to change a brother from the pollution of sin? Let us confess our faults one to another, forgive one another’s faults, pray for one another’s faults. In this way we shall wash one another’s feet.”