"Rejoice: the Lord is nigh." As Christmas draws near, the Church emphasizes the joy which should be in our hearts over all that the birth of our Savior means for us. The great joy of Christians is to see the day drawing nigh when the Lord will come again in His glory to lead them into His kingdom. The oft-repeated Veni("Come") of Advent is an echo not only of the prophets but also of the conclusion of the Apocalypse of St. John: "Come, Lord Jesus," the last words of the New Testament.
Today is known as Gaudete Sunday. The term Gaudete refers to the first word of the Entrance Antiphon, "Rejoice". Rose vestments are worn to emphasize our joy that Christmas is near, and we also light the rose candle on our Advent wreath. (cathollic culture.org)