Dear Brothers and Sisters, The Fourth Sunday of Easter offers us the figure of the Good Shepherd who knows his sheep: he calls them, he feeds them and he guides them. For over fifty years the universal Church has celebrated this Sunday as the World Day of Prayer for Vocations. In this way she reminds us of our need to pray, as Jesus himself told his disciples, so that “the Lord of the harvest may send out labourers into his harvest” (Lk 10:2)....