The first centuries of Islam saw the development of Sufism as one of the world's major mystical traditions. Although the later Sufi writings by mystics such as Rumi are known and available in translation, access to the crucial early period of Islamic mysticism has been far more limited. 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.