The formation of an orthodox scholasticism within the Muslim church appears as a development spread over the 4th-5th centuries of the Hijra (10-11 cent. A.D.), and is in three strata associated with the three leaders, al-Ashari, al-Baqilani, and al-Ghazali. Such a development, of course, is principally of interest for the internal history of Islam and the evolution of Muslim theology, but it had its influence also on the transmission of Arabic thought to Latin Christendom in two ways: (i.) directly, in that al-Ghazali was established as one of the great Arabic authorities when the Latins began to study the interpreters of Aristotle, and his teaching is quoted by St. Thomas Aquinas and other scholastic writers; and (ii.) indirectly, because a considerable part of the work of Ibn Rushd (Averroes) takes the form of controversy against the followers of al-Ghazali; his Destruction of the Destruction, for example, is a refutation of al-Ghazali's Destruction of the Philosophers. It thus becomes imperative to know something about the position and teaching of al-Ghazali and the influences which prepared the way for his work. In the period after this change al-Ashari wrote a controversial work against the Mutazilites, which bears the name Kitab ash-Sharh wa-t-Tafsil, "the book of explanation and exposition"; he was the author also of religious treatises called Luma "flashes," Mujaz "abridgment," Idah al-Burhan "elucidation of the Burhan," and Tabiyin "illustrations." His real importance, however, lay in founding a school of orthodox scholasticism, afterwards more fully developed by al-Baqilani, and gradually spreading through the Muslim world, although strongly opposed on the one side by the falasifah, who saw in its teaching the introduction of traditional beliefs limiting and restricting the Aristotelian doctrine, and on the other side by the more reactionary orthodox, who disapproved the use of philosophical methods as applied to theological subjects. This use of philosophy (c) As to freedom of the will. God creates power in the man and creates also the choice, and He then creates the act corresponding to this power and choice. Thus the action is "acquired" by the creature. Of the categories existence is the first substratum, and to this the other predicatables are added: none of these others are separable or per se, they can only exist in the essence. It is admitted that such qualities exist in the ens, but they are only adjuncts which come into being with the ens and go out of existence Al-Ghazali, following al-Ashari, taught that philosophical theory cannot form the basis of religious thought, thus opposing the position of the philosophers. By revelation only can the primary essentials of truth be attained. Philosophy itself is no equal or rival of revelation: it is no more than common sense and regulated thinking, which may be employed by men about religion or any other subject; at best it acts as a preservative against error in deduction and argument, the primary material for which, so far as religion is concerned, can be furnished only by revelation. But against this he appears also as the transmitter of the teaching already given, by al-Qushayri, which introduced the mysticism of the Sufis into orthodox Islam. Revelation indeed is given by means of the Quran and tradition, and it is sufficient to accept what is thus revealed, but the ultimate truth of revelation can be tested and proved only by the experience of the individual. So far as men are concerned this is possible by means Unlike Ibn Rushd, al-Ghazali thus emphasizes supra-rational intuition attained in a state of ecstasy, whereby the soul is raised above the world of shadow and reflection to the plane of reality. This was pure mysticism, and thus al-Ghazali introduces a Sufi element into orthodox Islam. At the same time he reduced Sufism to a scientific form, and endorsed terminology. Macdonald summarises his work under four heads: (i.) he established an orthodox mysticism: (ii.) he popularised the use of philosophy; (iii.) he rendered philosophy subordinate to theology, and (iv.) he restored the fear of God when the element of fear was tending to be thrust into the background, at least by the educated. From this time on the term kalam was usually applied to philosophy adapted to the use of theologians. The chief works left by al-Ghazali are the Ihya Ulum ad-Din, of which it is understood that a translation by H. Bauer is in preparation, and the Miyar al-Ilm, a treatise on logic. To posterity, however, he is best known by his Confessions, an autobiographical account of his spiritual life and development, which may not unfitly be placed beside the Confessions of St. Augustine. Al-Ghazali completes the development of orthodox Muslim. theology. From this time forth it ceased to have any originality, and for the most part showed signs of decadence. Here and there we find Sufi revivals; indeed, Sufism is the only phase of Islam which kept free from the rigid conservatism which has laid its iron hand of repression upon Muslim life and thought generally. In Yemen the system of al-Ghazali was kept alive by generations of Sufis, but for the most part Sufism preferred less orthodox paths. Against these Sufi movements we see from time to time others of a distinctly reactionary character, such as that of the Wahabis, who opposedORTHODOX SCHOLASTICISM