Real love is demanding. I would fail in my mission if I did not clearly tell you so. For it was Jesus - our Jesus himself - who said: 'You are my friends if you do what I command you'. Love demands effort and a personal commitment to the will of God. It means discipline and sacrifice, but it also means joy and human fulfilment.
"Pilgrimage of peace: the collected speeches of John Paul II in Ireland and the United States".