What is the third Luminous mystery about?

Answer 1

The Third Luminous Mystery: Proclamation of the Kingdom of God; please see the link below the answer box.

Jesus preaches the Kingdom of God with His call to conversion (Mt 3:17; Mk 1:14-15; Lk 4:14-22), and he set up the One, Holy, and Apostolic Church to proclaim this Mystery.

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from The Catechism of the Catholic Church, second edition, English translation 1994

1427 Jesus calls to conversion. This call is an essential part of the proclamation of the kingdom: "The time is fulfilled, and the kingdom of God is at hand; repent, and believe in the gospel." In the Church's preaching this call is addressed first to those who do not yet know Christ and his Gospel. Also, Baptism is the principal place for the first and fundamental conversion. It is by faith in the Gospel and by Baptism that one renounces evil and gains salvation, that is, the forgiveness of all sins and the gift of new life.

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1989 The first work of the grace of the Holy Spirit is conversion, effecting justification in accordance with Jesus' proclamation at the beginning of the Gospel: "Repent, for the kingdom of heaven is at hand." Moved by grace, man turns toward God and away from sin, thus accepting forgiveness and righteousness from on high. "Justification is not only the remission of sins, but also the sanctification and renewal of the interior man.

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670 Since the Ascension God's plan has entered into its fulfillment. We are already at "the last hour". "Already the final age of the world is with us, and the renewal of the world is irrevocably under way; it is even now anticipated in a certain real way, for the Church on earth is endowed already with a sanctity that is real but imperfect." Christ's kingdom already manifests its presence through the miraculous signs that attend its proclamation by the Church.

Answer 2

The fourth Luminous Mystery of the Rosary is the Transfiguration, which is in all the Gospels. In the Transfiguration, Jesus shows the glory (in advance) that He will merit through His passion. Moses and Elijah are there as representatives of the Old Testament, the Law and the prophets, from which we can draw two lessons. One is that Jesus is the center of all revelation for "all of Holy Scripture is one book, and this one book is Christ, for all of Holy Scripture speaks of Christ and is fulfilled in Him" (Hugh of St. Victor, De Arca Noe morali, 2, 8); on the other, that the books of the Old Testament are necessary for understanding Jesus Christ, for "if, as the apostle Paul says, Christ is the power and wisdom of God, it follows that ignorance of the Scriptures is ignorance of Christ" (St. Jerome, Commentarii in Isaiam, prol. 1). - extracted from The Navarre Bible, New Testament.