Sheol is even dimmer, further in the background, than Hades. It is a thousand miles away from the centre of Jewish religion; especially in the Psalms. They speak of Sheol (or “hell” or “the pit”) very much as a man speaks of “death” or “the grave” who has 110 belief in any sort of future state whatever—a man to whom the dead are simply dead, nothing, and there’s no more to be said.
