What was piety like before the commandments were revealed? How did Abraham live in a way that fulfilled the ideals of piety without the Torah? This question, raised in the ancient Jewish theology of Philo and central to the struggle of Paul with his own Judaism and his emerging Christian faith, was raised once again by the Hasidic masters of Eastern Europe in the eighteenth century. In a series of powerful and spiritually searching sermons, the Hasidic...