CIC 388 With the progress of Revelation, the reality of sin is also illuminated. Although to some extent the People of God in the Old Testament had tried to understand the pathos of the human condition in the light of the history of the fall narrated in Genesis, they could not grasp this story’s ultimate meaning, which is revealed only in the light of the death and Resurrection of Jesus Christ.1 We must know Christ as the source of grace in order to know Adam as the source of sin. The Spirit-Paraclete, sent by the risen Christ, came to “convict the world concerning sin”,2 by revealing him who is its Redeemer.

CIC 400 The harmony in which they had found themselves, thanks to original justice, is now destroyed: the control of the soul’s spiritual faculties over the body is shattered; the union of man and woman becomes subject to tensions, their relations henceforth marked by lust and domination.3 Harmony with creation is broken: visible creation has become alien and hostile to man.4 Because of man, creation is now subject “to its bondage to decay”.5 Finally, the consequence explicitly foretold for this disobedience will come true: man will “return to the ground”,6 for out of it he was taken. Death makes its entrance into human history.7

CIC 402 All men are implicated in Adam’s sin, as St. Paul affirms: “By one man’s disobedience many (that is, all men) were made sinners”: “sin came into the world through one man and death through sin, and so death spread to all men because all men sinned.”8 The Apostle contrasts the universality of sin and death with the universality of salvation in Christ. “Then as one man’s trespass led to condemnation for all men, so one man’s act of righteousness leads to acquittal and life for all men.”9

CIC 602 Consequently, St. Peter can formulate the apostolic faith in the divine plan of salvation in this way: “You were ransomed from the futile ways inherited from your fathers. .. with the precious blood of Christ, like that of a lamb without blemish or spot. He was destined before the foundation of the world but was made manifest at the end of the times for your sake.”10 Man’s sins, following on original sin, are punishable by death.11 By sending his own Son in the form of a slave, in the form of a fallen humanity, on account of sin, God “made him to be sin who knew no sin, so that in him we might become the righteousness of God.”12

CIC 612 The cup of the New Covenant, which Jesus anticipated when he offered himself at the Last Supper, is afterwards accepted by him from his Father’s hands in his agony in the garden at Gethsemani,13 making himself “obedient unto death”. Jesus prays: “My Father, if it be possible, let this cup pass from me. ..”14 Thus he expresses the horror that death represented for his human nature. Like ours, his human nature is destined for eternal life; but unlike ours, it is perfectly exempt from sin, the cause of death.15 Above all, his human nature has been assumed by the divine person of the “Author of life”, the “Living One”.16 By accepting in his human will that the Father’s will be done, he accepts his death as redemptive, for “he himself bore our sins in his body on the tree.”17

CIC 1008 Death is a consequence of sin. The Church’s Magisterium, as authentic interpreter of the affirmations of Scripture and Tradition, teaches that death entered the world on account of man’s sin.18 Even though man’s nature is mortal God had destined him not to die. Death was therefore contrary to the plans of God the Creator and entered the world as a consequence of sin.19 “Bodily death, from which man would have been immune had he not sinned” is thus “the last enemy” of man left to be conquered.20

1 Cf. Rom 5:12-21.
2 Jn 16:8.
3 Cf. Gen 3:7-16.
4 Cf. Gen 3:17,19.
5 Rom 8:21.
6 Gen 3:19; cf. 2:17.
7 Cf. Rom 5:12.
8 Rom 5:12,19.
9 Rom 5:18.
10 I Pt 1:18-20.
11 Cf. Rom 5:12; I Cor 15:56.
12 2 Cor 5:21; cf. Phil 2:7; Rom 8:3.
13 Cf. Mt 26:42; Lk 22:20.
14 Phil 2:8; Mt 26:39; cf. Heb 5:7-8.
15 Cf. Rom 5:12; Heb 4:15.
16 Cf. Acts 3:15; Rev 1:17; Jn 1:4; 5:26.
17 1 Pt 224; cf. Mt 26:42.
18 Cf. Gen 2:17; 3:3; 3:19; Wis 1:13; Rom 5:12; 6:23; DS 1511.
19 Cf. Wis 2:23-24.
20 GS 18 § 2; cf. 1 Cor 15:26.