From Catholic Culture:
"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.
Philippians 4: 4-6
Rejoice in the Lord always: again I say, rejoice. Let your modesty be known to all men: for the Lord is nigh. Be nothing solicitous: but in every thing by prayer let your petitions be made known to God. -- (Ps. 84. 2). Lord, Thou hast blessed Thy land: Thou hast turned away the captivity of Jacob. V.: Glory to the Father . . . -- Rejoice in the Lord always . . .
COLLECT - Incline Thine ear, we beseech Thee, O Lord, to our petitions: and, by the grace of Thy visitation, enlighten the darkness of our minds. Who livest and reignest, with God the Father, in the unity . . .
Brethren, Rejoice in the Lord always: again I say, rejoice. Let your modesty be known to all men. The Lord is nigh. Be nothing solicitous: but in every thing, by prayer and supplication, with thanksgiving, let your petitions be made known to God. And the peace of God, which surpasseth all understanding, keep your hearts and minds in Christ Jesus our Lord.
Psalms. 72: 2,3,6
Thou, O Lord, that sittest upon the Cherubim, stir up Thy might and come. V.: Give ear, O Thou that rulest Israel: that leadest Joseph like a sheep. Alleluia, alleluia. V.: Stir up, O Lord, Thy might, and come to save us. Alleluia.
John 1: 19-28
At that time the Jews sent from Jerusalem priests and levites to John, to ask him: Who art thou? And he confessed, and did not deny: and he confessed: I am not the Christ. And they asked him: What then? Art thou Elias? And he said: I am not. Art thou the Prophet? And he answered: No. They said therefore unto him: Who art thou, that we may give an answer to them that sent us? What sayest thou of thyself? He said: I am the voice of one crying in the wilderness, Make straight the way of the Lord, as said the Prophet Isaias. And they that were sent were of the Pharisees. And they asked him, and said to him: Why then dost thou baptize, if thou be not Christ, nor Elias, nor the Prophet? John answered them, saying: I baptize with water: but there hath stood one in the midst of you whom you know not. The same is He that shall come after me, who is preferred before me: the latchet of whose shoe I am not worthy to loose. These things were done in Bethania, beyond the Jordan, where John was baptizing.
Psalms 84: 2,3
Lord, Thou hast blessed Thy land: Thou hast turned away the captivity of Jacob: Thou hast forgiven the iniquity of Thy people.
SECRET - May the Sacrifice of our devotion, we beseech Thee, O Lord, be continually offered up to Thee, may it both complete the institution of the holy Mysteries, and wondrously accomplish in us Thy salvation. Through our Lord Jesus Christ, Thy Son, who liveth and reigneth with Thee in the unity of the Holy Ghost . . .
PREFACE (Preface of the Most Holy Trinity) - It is truly meet and just, right and for our salvation, that we should at all times, and in all places, give thanks unto Thee, O holy Lord, Father almighty, everlasting God; Who, together with Thine only-begotten Son, and the Holy Ghost, art one God, one Lord: not in the oneness of a single Person, but in the Trinity of one substance. For what we believe by Thy revelation of Thy glory, the same do we believe of Thy Son, the same of the Holy Ghost, without difference or separation. So that in confessing the true and everlasting Godhead, distinction in persons, unity in essence, and equality in majesty may be adored. Which the Angels and Archangels, the Cherubim also and Seraphim do praise: who cease not daily to cry out, with one voice saying:
Isaias 3 5: 4
Say: Ye fainthearted, take courage and fear not: behold our God will come, and will save us.
POST COMMUNION - We implore, O Lord, Thy mercy: that these divine helps may expiate our sins, and prepare us for the approaching feast. Through our Lord . .