Advent is a season of spiritual preparation for the celebration of the birth of Christ (Christmas) and looks forward to the future reign of Christ. Eschatological expectation rather than personal penitence is the central theme of the season. Advent is a preparation for rather than a celebration of Christmas, so Advent hymns should be sung instead of Christmas carols. The first Sunday of Advent is not the beginning of the Christmas season. The Christmas celebration begins on Christmas Eve and continues for the next "twelve days of Christmas."
Purple is normally Advent's liturgical color, associated both with the sovereignty of Christ and with penitence. Deep Blue is also sometimes used to distinguish the season from Lent. As the color of the night sky, Blue symbolizes Christ who in one ancient Advent song is called the "Dayspring" or source of day. As the color associated with Mary, Blue also reminds us that during Advent the church waits with Mary for the birth of Jesus.