Catechism of the Catholic Church

The Profession of Faith 143 whole Trinity appeared: the Father in the voice; the Son in the man; the Spirit in the shining cloud.” 298 You were transfigured on the mountain, and your disciples, as much as they were capable of it, beheld your glory, O Christ our God, so that when they should see you crucified they would understand that your Passion was voluntary, and proclaim to the world that you truly are the splendor of the Father. 299 556 On the threshold of the public life: the baptism; on the threshold of the Passover: the Transfiguration. Jesus’ baptism pro- claimed “the mystery of the first regeneration,” namely, our Bap- tism; the Transfiguration “is the sacrament of the second regeneration”: our own Resurrection. 300 From now on we share in the Lord’s Resurrection through the Spirit who acts in the sacra- ments of the Body of Christ. The Transfiguration gives us a fore- taste of Christ’s glorious coming, when he “will change our lowly body to be like his glorious body.” 301 But it also recalls that “it is through many persecutions that we must enter the kingdom of God”: 302 Peter did not yet understand this when he wanted to remain with Christ on the mountain. It has been reserved for you, Peter, but for after death. For now, Jesus says: “Go down to toil on earth, to serve on earth, to be scorned and crucified on earth. Life goes down to be killed; Bread goes down to suffer hunger; the Way goes down to be exhausted on his journey; the Spring goes down to suffer thirst; and you refuse to suffer?” 303 298 St. Thomas Aquinas, STh III, 45, 4, ad 2. 299 Byzantine Liturgy, Feast of the Transfiguration, Kontakion. 300 St. Thomas Aquinas, STh III, 45, 4, ad 2. 301 Phil 3:21. 302 Acts 14:22. 303 St. Augustine, Sermo 78, 6: PL 38, 492-493; cf. Lk 9:33. 1003