John 13:6-7

Most of the disciples remained silent as Jesus washed their feet, but Peter could not refrain from objecting. The Greek construction of what he said stresses the contrast between Jesus and himself. Jesus encouraged Peter to submit to having his feet washed with the promise that he would understand later why Jesus was washing them (cf. John 13:12-20). As the disciples did not understand that Jesus would die, they did not understand either the lessons that led up to His death. They would understand after He arose and the Holy Spirit enlightened their minds.