whereby this union is to be attained is not by the exercise of the intuitive faculty of reason but by piety and devotion. Still the two come very close when we find in the teachings of the later philosophers that the highest exercise of reason consists in the intuitive apprehension of the eternal verities rather than in any other activity of the intellect. Al-Junayd is stated by Jami to have been a Persian, and it is chiefly in Persian hands that the doctrines of Sufism develop and turn towards pantheism. Both agnosticism and pantheism are present practically in the later neo-Platonism; agnosticism as regards the unknowable First Cause, the God from the Agent Intellect is an emanation, a doctrine which develops in the teaching of the philosophers and of the Isma'ilians and kindred sects; but Sufi teaching centres its attention upon the knowable God, which the philosopher would describe as the Agent Intellect or Logos, and this develops more usually in a pantheistic direction. The doctrines thus developed and expressed by al-Junayd were boldly preached by his pupil, ash-Shibli of Kurasan (d. 335).
Al-Husayn b. Mansur al-Hallaj (d. 309) was a fellow-student of ash-Shibli, and shows Sufism as allied with extremely unorthodox elements. He was of Zoroastrian descent and closely in touch with the Qarmatians, and seems to have held those doctrines which are usually associated with the ghulat or extreme Shi'ites, such as transmigration, incarnation, etc. He was put to death as a heretic for
