the Arabs. The boldness of this great commentator of Aristotle aroused the full fury of the orthodox, who, in their zeal, attacked all philosophers indiscriminately, and had all philosophical writings committed to the flames. The theories of Ibn Roshd do not differ fundamentally from those of Ibn Bajjah and Ibn Tufail, who only follow the teachings of Ibn Sina and Al-Farabi. Like all Arabic Peripatetics, Ibn Roshd admits the hypothesis of the intelligence of the spheres and the hypothesis of universal emanation, through which motion is communicated from place to place to all parts of the universe as far as the supreme world—hypotheses which, in the mind of the Arabic philosophers, did away with the dualism involved in Aristotle's doctrine of pure energy and eternal matter. But while Al-Farabi, Ibn Sina, and other Arab philosophers hurried, so to speak, over subjects that trenched on religious dogmas, Ibn Roshd delighted in dwelling upon them with full particularity and stress. Thus he says, "Not only is matter eternal, but form is potentially inherent in matter; otherwise, it were a creation ex nihilo (Munk, "Mélanges," p. 444). According to this theory, therefore, the existence of this world is not only a possibility, as Ibn Sina declared—in order to make concessions to the orthodox—but also a necessity. Driven from the Arabian schools, Arabic philosophy found a refuge with the Jews, to whom belongs the honor of having transmitted it to the Christian world. A series of eminent men—such as the Tibbons, Narboni, Gersonides—joined in translating the Arabic philosophical works into Hebrew and commenting upon them. The works of Ibn Roshd especially became the subject of their study, due in great measure to Maimonides, who, in a letter addressed to his pupil Joseph ben Judah, spoke in the highest terms of Ibn Roshd's commentary. Influence of Andalusi mystical theosophy Vahid Brown states that the cross-fertilization among Jewish and Islamic philosophical mysticism, including Kabbalah and Sufism, in Al-Andalus, Spain during its Golden Age, apart from its impact on European Renaissance, had a strong influence in later developments in both philosophies in the rest of the Jewish and Muslim world. See also David ibn Merwan al-Mukkamas Early Islamic philosophy Golden age of Jewish culture in Spain Islamic philosophy Islamic-Jewish relations Jewish philosophy References Islamic philosophy Jewish philosophy Islam and Judaism