John 13:12-20

John 13:12-20 
English Standard Version (ESV)

  This is where we remember that Jesus saves us on purpose, for a purpose.  Notice that Jesus washes the feet of the disciples first.  This is critical for us to understand -- the love of Jesus is unconditional.  You have been cleansed from sin.  Accepting the Lordship of Jesus Christ is recognizing that God moves first -- Jesus doesn't wait for you to sort your life out before coming to you in grace and mercy.  You are saved without merit.
  Then, Jesus makes it explicitly clear that we are to imitate his selfless service of others.  Salvation isn't given just to cleanse our feet.  Jesus does this, modeling selfless service, and then sends us back out into the world so that we will do to others as has been done to us.  We have been loved selflessly, without limit.  How now will we love one another?  What service will you to to friends and neighbors and strangers and enemies?  We are not greater than Jesus, so we shall serve.  It's not presented as a choice, merely an expectation.