Arguably, no historical thinker has had as varied and fractious a reception within modern Judaism as Baruch (Benedict) Spinoza (1632-77), the seventeenth-century philosopher, pioneering biblical critic, and Jewish heretic from Amsterdam. Revered in many circles as the patron saint of secular Jewishness, he has also been branded as the worst traitor to the Jewish people in modern times. Jewish philosophy has cast Spinoza as marking a turning point...