Explain it, Hamilton muttered. This place—this bar. Why doesn't God erase it? If this world operates by moral laws—
This bar is necessary to the moral order. This is a sinkpit of corruption and vice, a fleshpot of iniquity. You think salvation can function without damnation? You think virtue can exist without sin? That's the trouble with you atheists; you don't grasp the mechanics of evil. Get on the inside and enjoy life, man. If you're one of the Faithful, you've got nothing to worry about.
Opportunist.
Bet your sweet soul.

Chapter 5 (p. 66) - Eye in the Sky (1957)