The opening chorus of Bach's Christmas Oratorio:

Rejoice and be glad! Come, praise the days//Glorify what the Lord has done this day.Cease being fearful, banish lament//Raises your voices full of rejoicing and gladness.Serve the Lord with wondrous chorus//Let us worship the Lord's Name!http://www.youtube.com/watch?v=w07Lj8HYICc&feature=related

Pax et bonum hominibus bonae voluntatis.