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 purple vestments. But on Gaudete Sunday, having passed the midpoint of Advent, the…