In this celebration of the Eucharist we have reached the high point of this World Youth Day. There are many people today who feel attracted by the figure of Christ and want to know him better. They realise that he is the answer to so many of our deepest concerns. But who is he really? How can someone who lived on this earth so long ago have anything in common with us today?
The Gospel we have just heard (cf. Mt 16:13-20) suggests two different ways of knowing Christ. The first is an impersonal knowledge, one based on current opinion. When Jesus asks: "Who do people say that the Son of Man is?", the disciples answer: "Some say John the Baptist, but others Elijah, and still others Jeremiah or one of the prophets". In other words, Christ is seen as yet another religious figure, like those who came before him.
Then Jesus turns to the disciples and asks them: "But who do you say that I am?" Peter responds with what is the first confession of faith: "You are the Messiah, the Son of the living God". Faith is more than just empirical or historical facts it is an ability to grasp the mystery of Christ's person in all its depth.
Gift of God
Yet faith is not the result of human effort, of human reasoning, but rather a gift of God: "Blessed are you, Simon son of Jonah! For flesh and blood has not revealed this to you, but my Father in heaven". Faith starts with God, who opens his heart to us and invites us to share in his own divine life. Faith does not simply provide information about who Christ is rather, it entails a personal relationship with Christ, a surrender of our whole person, with all our understanding, will and feelings, to God's self-revelation.
So Jesus' question: "But who do you say that I am?", is ultimately a challenge to the disciples to make a personal decision in his regard. Faith in Christ and discipleship are strictly interconnected.
And, since faith involves following the Master, it must become constantly stronger, deeper and more mature, to the extent that it leads to a closer and more intense relationship with Jesus. Peter and the other disciples also had to grow in this way, until their encounter with the Risen Lord opened their eyes to the fullness of faith.
Jesus responds to Peter's confession by speaking of the Church: "And I tell you, you are Peter, and on this rock I will build my Church". What do these words mean? Jesus builds the Church on the rock of the faith of Peter, who confesses that Christ is God.
The Church, then, is not simply a human institution, like any other. Rather, she is closely joined to God. Christ himself speaks of her as "his" Church. Christ cannot be separated from the Church any more than the head can be separated from the body (cf. 1 Cor 12:12). The Church does not draw her life from herself, but from the Lord.
As the Successor of Peter, let me urge you to strengthen this faith which has been handed down to us from the time of the Apostles. Make Christ, the Son of God, the centre of your life. But let me also remind you that following Jesus in faith means walking at his side in the communion of the Church. We cannot follow Jesus on our own. Anyone who would be tempted to do so "on his own", or to approach the life of faith with the kind of individualism so prevalent today, will risk never truly encountering Jesus, or will end up following a counterfeit Jesus.
Having faith means drawing support from the faith of your brothers and sisters, even as your own faith serves as a support for the faith of others. I ask you, dear friends, to love the Church which brought you to birth in the faith, which helped you to grow in the knowledge of Christ and which led you to discover the beauty of his love. Growing in friendship with Christ necessarily means recognising the importance of joyful participation in the life of your parishes, communities and movements, as well as the celebration of Sunday Mass, frequent confession, and the cultivation of personal prayer and meditation on God's word.
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 and 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.
I ask you to pray for the Pope, so that, as the Successor of Peter, he may always confirm his brothers and sisters in the faith. May all of us in the Church, pastors and faithful alike, draw closer to the Lord each day. May we grow in holiness of life and be effective witnesses to the truth that Jesus Christ is indeed the Son of God, the Saviour of all mankind and the living source of our hope.
This is a slightly shortened version of Benedict XVI's homily at the World Youth Day 2011 Final Mass on Sunday, 21 August 2011, at the Cuatro Vientos Air Base, Madrid.