John 13:7
Jesus answered, 'You do not now understand what I am doing, but later you will understand' — Jesus does not argue or rebuke Peter's refusal but invites him into patient faith. The now-and-later temporal structure is crucial: understanding cannot come by reason alone but only through participating in the event, through allowing oneself to be served by love. This is the logic of discipleship: we must receive before we comprehend, must be acted upon before we can act. The footwashing is a parable of the entire redemptive work—we cannot grasp the cross until we have been crucified with him, cannot understand dying with him until we have already consented to die.