It is when faced with death that the enigma of the human condition is most evident. People are tormented not only by pain and the gradual diminution of their bodily powers,but also, and even more, by the dread of forever ceasing to be. But a deep instinct leads them rightly to shrink from, and to reject, the utter ruin and total loss of their personality. Because they bear in themselves the seed of eternity, which cannot be reduced to mere matter, they rebel against death. All the helps made available by technology, however useful they may be, cannot set their anguished minds at rest. They may prolong their life-span; but this does not satisfy their heartfelt longing, one that can never be stifled, for an after-life.
While the imagination is lost before the mystery of death, the church, taught by divine revelation, declares that God has created people in view of a blessed destiny that lies beyond the boundaries of earthly misery. Moreover, the Christian faith teaches that bodily death, from which people would have been immune had humanity not sinned, will be overcome when that wholeness which they lost through their own fault will be given once again to them by the almighty and merciful Savior. For God has called men and women, and still calls them, to attach themselves with all their being to him in sharing for ever a life that is divine and free from all decay.from the Second Vatican Council's Pastoral Constitution on the Church in the Modern World (Gaudium et Spes 18 & 22)