"....but true joy is connected with our relationship to God. Those who have met Jesus in their lives experience a serenity and a joy in their hearts that no one and no situation can take away.
St. Augustine understood it quite well; in his search for truth, for peace, for joy, after having sought it in vain in many things, he concludes with the celebrated expression according to which man's heart is restless, does not find serenity and peace, until it finds rest in God (cf. Confessions, I, 1, 1).
True joy is not a mere passing state of soul, nor something that is achieved by our own power but is a gift; it is born from the encounter with the living person of Jesus, from making space for him in us, from welcoming the Holy Spirit who guides our life.
It is the invitation that the Apostle Paul makes, who says: "May the God of peace himself make you perfectly holy and may you entirely, spirit, soul, and body, be preserved blameless for the coming of our Lord Jesus Christ" (1 Thessalonians 5:23). In this Advent season let us strengthen our certainty that the Lord has come among us and continues to renew his presence of consolation, love and joy. We trust in him; again as St. Augustine says in light of his experience: the Lord is closer to us than we are to ourselves...
Let us entrust our journey to the Immaculate Virgin, whose spirit exulted in God the Savior. May she be the one to guide our hearts in the joyous expectation of the coming of Jesus, an expectation that is rich in prayer and good works."
see full content of Pope Benedict's address given Sunday December 11 at http://www.zenit.org/article-33973?l=english