CATECHISM OF THE CATHOLIC CHURCH
SECOND EDITION

Paragraphs 537–541

537 Through Baptism the Christian is sacramentally assimilated to Jesus, who in his own baptism anticipates his death and resurrection. The Christian must enter into this mystery of humble self-abasement and repentance, go down into the water with Jesus in order to rise with him, be reborn of water and the Spirit so as to become the Father's beloved son in the Son and "walk in newness of life":

Let us be buried with Christ by Baptism to rise with him; let us go down with him to be raised with him; and let us rise with him to be glorified with him.

Everything that happened to Christ lets us know that, after the bath of water, the Holy Spirit swoops down upon us from high heaven and that, adopted by the Father's voice, we become sons of God.

538 The Gospels speak of a time of solitude for Jesus in the desert immediately after his baptism by John. Driven by the Spirit into the desert, Jesus remains there for forty days without eating; he lives among wild beasts, and angels minister to him. At the end of this time Satan tempts him three times, seeking to compromise his filial attitude toward God. Jesus rebuffs these attacks, which recapitulate the temptations of Adam in Paradise and of Israel in the desert, and the devil leaves him "until an opportune time".
539 The evangelists indicate the salvific meaning of this mysterious event: Jesus is the new Adam who remained faithful just where the first Adam had given in to temptation. Jesus fulfills Israel's vocation perfectly: in contrast to those who had once provoked God during forty years in the desert, Christ reveals himself as God's Servant, totally obedient to the divine will. In this, Jesus is the devil's conqueror: he "binds the strong man" to take back his plunder. Jesus' victory over the tempter in the desert anticipates victory at the Passion, the supreme act of obedience of his filial love for the Father.
540 Jesus' temptation reveals the way in which the Son of God is Messiah, contrary to the way Satan proposes to him and the way men wish to attribute to him. This is why Christ vanquished the Tempter for us: "For we have not a high priest who is unable to sympathize with our weaknesses, but one who in every respect has been tested as we are, yet without sinning." By the solemn forty days of Lent the Church unites herself each year to the mystery of Jesus in the desert.
541 "Now after John was arrested, Jesus came into Galilee, preaching the gospel of God, and saying: 'The time is fulfilled, and the kingdom of God is at hand: repent, and believe in the gospel.'" "To carry out the will of the Father Christ inaugurated the kingdom of heaven on earth." Now the Father's will is "to raise up men to share in his own divine life". He does this by gathering men around his Son Jesus Christ. This gathering is the Church, "on earth the seed and beginning of that kingdom".