Friendship with Jesus will also lead you to bear witness to the faith wherever you are, even when it meets with rejection or indifference. We cannot encounter Christ and not want to make him known to others. So do not keep Christ to yourselves! Share with others the joy of your faith. The world needs the witness of your faith, it surely needs God. I think that the presence here of so many young people, coming from all over the world, is a wonderful proof of the fruitfulness of Christ's command to the Church: "Go into all the world and proclaim the Gospel to the whole creation" (Mk 16:15). You too have been given the extraordinary task of being disciples and missionaries of Christ in other lands and countries filled with young people who are looking for something greater and, because their heart tells them that more authentic values do exist, they do not let themselves be seduced by the empty promises of a lifestyle which has no room for God.
Pope Benedict XVI, WYD 2011