Traditional Jews encounter the prayer-book-the Siddur-more often in their daily lives than any other text, yet it is mysteriously absent from their otherwise nearly comprehensive curriculum of study. In addition, they tend to recite it mantrically, more for its sound than its meaning. The neglect of meaning is so complete that no edition of the prayer-book has yet appeared with a comprehensive range of commentaries. The present work, the first to examine this paradox, explains it as a reluctance to engage with the intellectual and emotional questions that lie just beneath the surface of the...