A belief in predestination animated both the Bolsheviks and ISIS: the inexorability of the future, and thus of victory, as foretold in the sacred prophesies of Marx or Mohammad. They could not fail. Alive or dead, they won. Napoleon used to say that a battle was won or lost in the minds of the combatants before the first shot was fired. Is there an energy more powerful or a cause more mesmerizing and irresistible, or confidence in the inevitability of victory greater than the one generated by the ecstatic hope of liberating humanity from the miseries of daily life and ushering it into a conflictless Eden?