True liturgy, the liturgy of the communion of saints, gives man once again his completeness. It instructs him once again in silence and in singing by opening for him the depths of the sea and by teaching him to fly—the existence of the angels. By “lifting up the heart;” true liturgy allows the buried song to resound in man once again. Indeed, we could now actually say that true liturgy can be recognized by the fact that it liberates from everyday activity and restores to us both the depths and the heights: silence and singing. True liturgy is recognizable because it is cosmic and not limited to a group. True liturgy sings with the angels, and true liturgy is silent with the expectant depths of the universe. And thus true liturgy redeems the earth.
Cardinal Joseph Ratzinger, Liturgy and Church Music