10. Liturgical celebration nourishes the spiritual life of the faithful. The principle I formulated in my Apostolic Letter Novo Millennio Ineunte:  "calling for a Christian life distinguished above all in the art of prayer"²⁷, stems from the Liturgy. Sacrosanctum Concilium interprets this urgency prophetically, spurring the Christian community to intensify its prayer life, not only through the Liturgy but also in "popular devotions", for as long as these are in harmony with the Liturgy, they are in some way derived from it and lead to it²⁸. The pastoral experience in recent decades has reinforced this insight. In this regard, the Congregation for Divine Worship and the Discipline of the Sacraments has made a valuable contribution with its Directory on Popular Piety, Liturgy, Principles, Guidelines²⁹. Then, with the Apostolic Letter Rosarium Virginis Mariae³⁰ and the announcement of the Year of the Rosary, I myself wanted to make explicit the contemplative treasure of this traditional prayer that has spread far and wide among the People of God. I therefore recommended its rediscovery as a privileged path to contemplation of the Face of Christ at the school of Mary.