This broad-ranging study the first full-length investigation of conceptions of faith and trust in the Judeo-Arabic tradition explores a family of related concepts-faith (<i>im&#257;n emunah</i>) conviction (<i>i&#8216;tiqa&#772;d</i>) and trust/reliance (<i>tawakkul/ittik&#257;l</i>)&#8212;in Saadya Ba&#7717;ya Halevi Maimonides Abraham Maimonides and the Egyptian pietist circle of Abraham he-&#7716;asid. The work points to a rich spectrum of conceptions of faith and trust&#8212;from the purely cognitive to the experiential and affective. What emerges are themes of faithfulness loyalty experiential certainty and trustworthiness expressed in devotion to a way of life that embodies these ideals. The virtue of trust expresses steadfast commitment to the truth.<p><br></p><p>This study vividly illustrates the Jewish-Arab symbiosis highlighting the shared spiritual language and rich intertwined worlds of Islamic and Jewish philosophy theology and mysticism.<br></p>