A blessed Gaudete Sunday to all of you! Certain Sundays throughout
the liturgical year have taken their names from the first word in Latin of the Introit; the entrance antiphon at Mass. Gaudete Sunday is one of these. Gaudete Sunday is the Third Sunday of Advent. The Introit for Gaudete Sunday, in both the Traditional Latin Mass and the Novus Ordo, is taken from Philippians 4:4, 5: “Gaudete in Domino semper” (“Rejoice in the Lord always”).
Like Lent, Advent is a penitential season, so the priest normally wears violet (purple) vestments, but on Gaudete Sunday, having passed the midpoint of Advent, the Church lightens the mood a little, and the priest may wear rose vestments. The change in color provides us with encouragement to continue our spiritual preparation — especially prayer and fasting — for Christmas. For this same reason, the third candle of the Advent wreath lit on Gaudete Sunday is traditionally rose-colored.