The doctrines of Christians and Jews are the closest of all the world's religions. Particularly in the bearing of religious faith upon social, political, economic, and cultural concerns in this world, the vocations of Jews and Christians are remarkably analogous. Both are narrative religions. Both are religions of The Book. Both religions teach respect for this world, for the flesh, for the concrete. Both religions instruct their members in a vocation not merely to escape from this world but to change this world. Both find the historical task of modernization a challenge, yet a challenge to be taken up in faith and in hope. More easily than any other of the major religions both seem to adjust—although not without enormous struggle—to modern urban life. Both have a commitment to intellect in its rational and scientific parts as well as its mystical, poetic, and intuitive parts.