Part of a continuing series.
A selected quote from the Catechism of the Catholic Church in honor of the Year of Faith (October 11, 2012 - November 24, 2013)
599 Jesus' violent death was not the result of chance in an unfortunate coincidence of circumstances, but is part of the mystery of God's plan, as St. Peter explains to the Jews of Jerusalem in his first sermon on Pentecost: "This Jesus [was] delivered up according to the definite plan and foreknowledge of God." This Biblical language does not mean that those who handed him over were merely passive players in a scenario written in advance by God.
601 The Scriptures had foretold this divine plan of salvation through the putting to death of "the righteous one, my Servant" as a mystery of universal redemption, that is, as the ransom that would free men from the slavery of sin. Citing a confession of faith that he himself had "received", St. Paul professes that "Christ died for our sins in accordance with the scriptures." In particular Jesus' redemptive death fulfills Isaiah's prophecy of the suffering Servant. Indeed Jesus himself explained the meaning of his life and death in the light of God's suffering Servant. After his Resurrection he gave this interpretation of the Scriptures to the disciples at Emmaus, and then to the apostles.
603 Jesus did not experience reprobation as if he himself had sinned. But in the redeeming love that always united him to the Father, he assumed us in the state of our waywardness of sin, to the point that he could say in our name from the cross: "My God, my God, why have you forsaken me?" Having thus established him in solidarity with us sinners, God "did not spare his own Son but gave him up for us all", so that we might be "reconciled to God by the death of his Son".
604 By giving up his own Son for our sins, God manifests that his plan for us is one of benevolent love, prior to any merit on our part: "In this is love, not that we loved God but that he loved us and sent his Son to be the expiation for our sins." God "shows his love for us in that while we were yet sinners Christ died for us."
610 Jesus gave the supreme expression of his free offering of himself at the meal shared with the twelve Apostles "on the night he was betrayed". On the eve of his Passion, while still free, Jesus transformed this Last Supper with the apostles into the memorial of his voluntary offering to the Father for the salvation of men: "This is my body which is given for you." "This is my blood of the covenant, which is poured out for many for the forgiveness of sins."
611 The Eucharist that Christ institutes at that moment will be the memorial of his sacrifice. Jesus includes the apostles in his own offering and bids them perpetuate it. By doing so, the Lord institutes his apostles as priests of the New Covenant: "For their sakes I sanctify myself, so that they also may be sanctified in truth."
613 Christ's death is both the Paschal sacrifice that accomplishes the definitive redemption of men, through "the Lamb of God, who takes away the sin of the world", and the sacrifice of the New Covenant, which restores man to communion with God by reconciling him to God through the "blood of the covenant, which was poured out for many for the forgiveness of sins".
614 This sacrifice of Christ is unique; it completes and surpasses all other sacrifices. First, it is a gift from God the Father himself, for the Father handed his Son over to sinners in order to reconcile us with himself. At the same time it is the offering of the Son of God made man, who in freedom and love offered his life to his Father through the Holy Spirit in reparation for our disobedience.
618 The cross is the unique sacrifice of Christ, the "one mediator between God and men". But because in his incarnate divine person he has in some way united himself to every man, "the possibility of being made partners, in a way known to God, in the paschal mystery" is offered to all men. He calls his disciples to "take up [their] cross and follow [him]", for "Christ also suffered for [us], leaving [us] an example so that [we] should follow in his steps." In fact Jesus desires to associate with his redeeming sacrifice those who were to be its first beneficiaries. This is achieved supremely in the case of his mother, who was associated more intimately than any other person in the mystery of his redemptive suffering.
Apart from the cross there is no other ladder by which we may get to heaven.624 "By the grace of God" Jesus tasted death "for every one". In his plan of salvation, God ordained that his Son should not only "die for our sins" but should also "taste death", experience the condition of death, the separation of his soul from his body, between the time he expired on the cross and the time he was raised from the dead. The state of the dead Christ is the mystery of the tomb and the descent into hell. It is the mystery of Holy Saturday, when Christ, lying in the tomb, reveals God's great sabbath rest after the fulfillment of man's salvation, which brings peace to the whole universe.
627 Christ's death was a real death in that it put an end to his earthly human existence. But because of the union which the person of the Son retained with his body, his was not a mortal corpse like others, for "it was not possible for death to hold him" and therefore "divine power preserved Christ's body from corruption." Both of these statements can be said of Christ: "He was cut off out of the land of the living", and "My flesh will dwell in hope. For you will not abandon my soul to Hades, nor let your Holy One see corruption." Jesus' Resurrection "on the third day" was the sign of this, also because bodily decay was held to begin on the fourth day after death.
630 During Christ's period in the tomb, his divine person continued to assume both his soul and his body, although they were separated from each other by death. For this reason the dead Christ's body "saw no corruption" (Acts 13:37).