The occasional wail of babies in the basilica contrasted at times with the sweet voices of the choir.
The Argentine-born Pope has also encouraged his flock to be a joyful church, and he called Jesus, "the light who brightens the darkness".
In the world's history and our own personal history, Francis said, "there are both bright and dark moments, lights and shadows." He added "if our heart is closed, if we are dominated by pride, deceit, self-seeking, then darkness falls within us and around us".
In the Holy Land, thousands of Christian pilgrims from around the world packed the West Bank town of Bethlehem. The heavy turnout, its highest in years, helped lift spirits in Bethlehem as leaders expressed hope that the coming year would finally bring the Palestinians an independent state of their own.
"The message of Christmas is a message of peace, love and brotherhood. We have to be brothers with each other," said Latin Patriarch Fouad Twal, the top Roman Catholic cleric in the Holy Land.
Excited tourists milled about the town's Manger Square, stopping in restaurants and souvenir shops and admiring a large, illuminated Christmas Tree. Marching bands and scout troops performed for the visitors.
- AP