The chief cause was for the sake of the Word. This is because the Word is Divine truth itself, which teaches us that there is a God, a heaven and a hell, and life after death; it also teaches ios how to live and what to believe, to enable us to reach heaven and so to be happy for ever.
All of these points would be totally unknown without a revelation, which in this world means without the Word. Yet man was created in such a way that he could not die, as far as his interior are concerned.
from Life on Other Planets, Section 114