Franz Rosenzweig, one of the century's great Jewish thinkers, wrote his gem of a book in 1921 as a more accessible pr cis of his famous Star of Redemption. An elegant introduction to Rosenzweig's "new thinking," Understanding the Sick and the Healthy was written for a lay audience and takes the form of an ironic narrative about convalescence. With superb simplicity and beauty, it puts forth an important critique of the nineteenth-century...