You young people, through World Youth Day, are in a way manifesting your desire to participate in this mission. In this regard, my dear young friends, I want to remind you here of some key truths on which to meditate. Once again I repeat that only Christ can fulfil the most intimate aspirations that are in the heart of each person. Only Christ can humanise humanity and lead it to its ?divinisation?. Through the power of his Spirit he instils divine charity within us, and this makes us capable of loving our neighbour and ready to be of service. The Holy Spirit enlightens us, revealing Christ crucified and risen, and shows us how to become more like Him so that we can be ?the image and instrument of the love which flows from Christ? (
Deus Caritas Est
, 33). Those who allow themselves to be led by the Spirit understand that placing oneself at the service of the Gospel is not an optional extra, because they are aware of the urgency of transmitting this Good News to others. Nevertheless, we need to be reminded again that we can be witnesses of Christ only if we allow ourselves to be led by the Holy Spirit who is ?the principal agent of evangelisation? (cf.
Evangelii Nuntiandi
, 75) and ?the principal agent of mission? (cf.
Redemptoris Missio
, 21).