The Third Sunday of Advent swells with optimism as we hear “Rejoice always,” the beginning of the reading from 1 Thessalonians. Isaiah and the psalmist make clear that God is turning our mourning into laughter and shouts of joy. “All God’s children got a robe,” go the words of a spiritual. It is not so much a stately, formal, pressed outfit as it is a set of party clothes, clothes we are happy to wear. We receive that robe in baptism, and in worship we gather for a foretaste of God’s party.