This volumes opens with an essay on the place of spirituality within the Islamic tradition. Immediately following are the foundation texts of the pre-Sufi spirituality: the Qur'an passages most important to the mystical tradition; the accounts of Muhammad's heavenly ascent; and the crucial work of early poets in setting a poetic sensibility for speaking of union with the divine beloved. The volume then presents the sayings attributed to the key early figures of Islamic spirituality: Ja'far as-Saddiq, the Sixth Imam of the Shi'ite Tradition; Rabi'a, the most famous woman saint of classical Islam; Muhasibi, the founder of Islamic moral psychology; Bistami, whose sayings on mystical union have generated fascination and controversy throughout the Islamic tradition and more.