Second, it is a time to reflect and prepare for Christ's Second Coming at the end of time. During the season of Advent we remember the long years of waiting by the people of Israel for the Messiah, the messages of hope in the prophets, and how Mary and Joseph were faithful to God's plan. Advent is not a penitential season, as Lent is.
Advent is a time of joyful preparation and expectation.
The Gloria is omitted on Sundays in Advent not as a sign of repentance, but to create a longing that will inspire people to sing it more joyfully on Christmas. Scripture The scripture selections and the prayers of the liturgy for the season reflect the two themes described above. From the beginning of Advent until December 16 the focus is on preparation for the coming of God's Kingdom. From December 17 to December 24 the theme shifts to the anticipation of the birth of Jesus and his ministry. The gospel reading during each Sunday of Advent reflects these themes.