“In the face of death the enigma of human existence reaches its climax. Man is not only the victim of pain and the progressive deterioration of his body; he is also and more deeply, tormented by the fear of final extinction. But the instinctive judgment of his heart is right when he shrinks from, and rejects, the idea of a total collapse and definitive end of his own person. He carries within him the seed of eternity, which cannot be reduced to matter alone, and so he rebels against death. All efforts of technology, however useful they may be, cannot calm his anxieties; the biological extension of his life-span cannot satisfy the desire inescapably present in his heart for a life beyond this life.
Imagination is completely helpless when confronted with death. Yet the Church, instructed by divine revelation, affirms that man has been created by God for a destiny of happiness beyond the reach of earthly trials. Moreover, the Christian faith teaches that bodily death, to which man would not have been subject if he had not sinned, will be conquered; the almighty and merciful Savior will restore man to the wholeness that he had lost through his own fault. God has called man, and still calls him, to be united in his whole being in perpetual communion with himself in the immortality of the divine life. This victory has been gained for us by the risen Christ, who by his own death has freed man from death.”
~From the pastoral constitution on the Church in the modern world of the Second Vatican Council