But all this time the second form of Sufiism had been slowly forcing its way. It was essentially speculative and theological rather than ascetic and devotional. When it gained the upper hand, _zahid_ (ascetic) was no longer a convertible term with Sufi. We pass over the boundary between Thomas à Kempis and St. Francis to Eckhart and Suso. The roots of this movement cannot be hard to find in the light of what has preceded. They lie partly in the neo-Platonism which is the foundation of the philosophy of Islam. Probably it did not come to the Sufis along the same channels by which it reached al-Farabi. It was rather through the Christian mystics and, perhaps, especially through the Pseudo-Dionysius the Areopagite, and his asserted teacher, Stephen bar Sudaili with his Syriac “Book of Hierotheos.” We need not here consider whether the Monophysite heresy is to be reckoned in as one of the results of the dying neo-Platonism. It is true that outlying forms of it meant the frank deifying of a man and thus raised the possibility of the equal deifying of any other man and of all men. But there is no certainty that these views had an influence in Islam. It is enough that from A.D. 533 we find the Pseudo-Dionysius quoted and his influence strong with the ultra Monophysites, and still more, thereafter, with the whole mystical movement in Christendom. According to it, all is akin in nature to the Absolute, and all this life below is only a reflection of the glories of the upper sphere, where God is. Through the sacraments and a hierarchy of angels man is led back toward Him. Only in ecstasy can man come to a knowledge of Him. The Trinity, sin and the atonement fade out of view. The incarnation is but an example of how the divine and the human can join. All is an emanation or an emission of grace from God; and the yearnings of man are back to his source. The revolving spheres, the groaning and travailing nature are striving to return to their origin. When this conception had seized the Oriental Church; when it had passed into Islam and dominated its emotional and religious life; when through the translation of the Pseudo-Dionysius by Scotus Erigena in 850, it had begun the long contest of idealism in Europe, the dead school of Plotinus had won the field, and its influence ruled from the Oxus to the Atlantic.