S omething there is that doesn’t love a wall, That wants it down," wrote Robert Frost. Martha Nussbaum doesn’t cite Frost directly, but the spirit of that poem hovers over her new book, even if what she has in mind is less Frost’s rural New England than Thomas Jefferson and the conventional shibboleths of East Coast liberalism. In this powerfully argued and often moving book, Nussbaum, a distinguished professor of philosophy at the University of Chicago, takes a deftly wielded sledgehammer to the "wall of separation" between church and the state much beloved of liberals–not, as some would have it, to allow a religious takeover of the public sphere, but to make for a neutral public sphere, safe for religious and non-religious citizens, of all shapes and sizes.