Advent
Readings and practices of the Advent season emphasize both penitence and the joyful expectation of the Lord’s coming. From the First Sunday of Advent to 16 December, the liturgical focus is on penitence and preparation for the second coming—with readings centered around the messianic prophecies of John the Baptist and Isaiah, and gospel selections which depict Jesus as the fulfillment of those prophecies. Also during this period, violet vestments are worn by the clergy (rose vestments are also acceptable on the Third, or “Gaudete” Sunday), further emphasizing the theme of repentance.
Liturgies of the final week of Advent focus on the approaching birth of Christ, with the role of the Blessed Mother receiving special emphasis. The observation of a preparatory season prior to the celebration of Christmas dates back to the fourth century.
The Old Testament readings are prophecies of the Messiah and of Messianic times, especially from the book of Isaiah.
The apostolic readings provide exhortations and proclamations in keeping with the different Advent themes.
Liturgies of the final week of Advent focus on the approaching birth of Christ, with the role of the Blessed Mother receiving special emphasis.