"Just as I have loved you,
you also should love one another.
By this everyone will know
that you are my disciples.
At the Last Supper Jesus tells his disciples that he won't be with them much longer (13:33-35) so this new commandment takes on the power of his last wish for his followers. It seems impossible until we remember that Jesus is living in us and sharing with us his undeserved way of loving. It will be the brand by which all mankind will recognize his followers.