It seems to underlie everything that makes the world difficult and dangerous for man.
Christians, though they hope for salvation, nevertheless are never ever sure they're on the right path, or that they've done enough to merit eternal life in heaven.
Thus, the constant return to the citadel of faith both to reaffirm their own belief and achieve some sort of temporary, provisional peace in this life.
After all, an awful lot of time remains in eternity if you're not in the right place.
If heaven were guaranteed, then there'd be no need to punish oneself in life.
A militant young Muslim in Gaza said to a reporter, "The thing that makes you in the West weak is that you treasure life; we who know what awaits us in our Islamic faith love death with the same intensity. It cannot come soon enough."
Thus, we see how it is that a life lived without the fear of death can be a reality.
But is it truly necessary to love death in order not to fear it?
Is it not possible to love life and not, in the final analysis, fear death?