Some account of the work was given in an article in the _British Quarterly Review_ for July, 1885; but I thought that a complete translation would probably be welcomed by a considerable circle of English readers. The book has many attractions. If the development of the inner life of man can ever be characterised as a romance, the biography of Maimon may, in the truest sense, be said to be one of the most romantic stories ever written. Perhaps no literature has preserved a more interesting record of a spirit imprisoned within almost insuperable barriers to culture, yet acquiring strength to burst all these, and even to become an appreciable power in directing the course of speculation. The book, however, is much more than a biography; it possesses historical interest. It opens up what, to many English readers, must be unknown efforts of human thought, unknown wanderings of the religious life. The light, which it throws upon Judaism especially, both in its speculative and in its practical aspects, is probably, in fact, unique. For the sketches, which the book contains, of Jewish speculation and life were made at a time when the author had severed all vital connection with his own people and their creed; and they are therefore drawn from a point of view outside of Jewish prejudices: but they are penned by one who had been brought up to believe the divine mission of his people, as well as the divine authority of their religion; and the criticism of his old faith is generally tempered by that kindly sympathy, with which the heart is apt to be warmed on lingering over the companionships and other associations of earlier years. Maimon's account of Jewish philosophy and theology acquires an additional value from the fact, that he was caught in the full tide of the Kantian movement, and he was thus in a position to point out unexpected affinities between many an old effort of speculative thought among the Jews and the philosophical tendencies of modern Christendom.