In , Saadya sought to rescue believers from "a sea of doubt and the waters of confusion" into which they had been cast by Christianity, Islam, and other faiths. By employing philosophical—or kalamic—argumentation to examine and defend traditional Jewish beliefs, Saadya hoped to turn blind faith into conviction based on rational understanding. First published in 1946, and reprinted here without alteration, Alexander Altmann’s judicious abridgment of his own translation has remained the standard edition of this influential work. A new Introduction by Daniel Frank sets Saadya’s work in its broader historical, cultural, and philosophical contexts.