How long Ghazzali occupied his professorship at Nishapur the second time is not precisely clear. Only five or six years of his life remained, and towards the close he again resigned his post to give himself up to a life of contemplation to which he felt irresistibly drawn, in his native city of Tus. Here he spent the rest of days in devotional exercises in friendly intercourses with other Sufis and in religious instruction of the young. He died, devout as he lived, in the fifty-fourth year of his age, A.D. 1111. He founded a convent for Sufis and a professorship of jurisprudence. Ghazzali's activity as an author during his relatively short life was enormous. According to the literary historians, he is the author of ninety-nine different works. These are not all known to us, but there are existing in the West a considerable quantity of them, some in Latin and Hebrew translations, as he was much studied by the Jews in the Middle Ages. A writer in the Jewish Encyclopaedia says (_sub. voc._), "From his 'Makasid-al-Falasifah' in which he expounded logic, physics and metaphysics according to Aristotle, many a Jewish student of philosophy derived much accurate information. It was not, however, through his attacks on philosophy that Ghazzali's authority was established among Jewish thinkers of the middle ages, but through the ethical teachings in his theological works. He approached the ethical idea of Judaism to such an extent that some supposed him to be actually drifting in that direction." Although Ghazzali was a Persian, both by race and birthplace, most of his works are composed in Arabic, that language being as familiar to Muhammadan theologians as Latin to those of Europe in the Middle Ages. One of his most important works is the "Tahafut al falasifah," "Destruction of the Philosophers," which the great Averroes endeavoured to refute. Somewhat in the style of Mr. Balfour's "Defence of philosophic doubt," Ghazzali attempts to erect his religious system on a basis of scepticism. He denies causation as thoroughly as Hume, but asserts that the divine mind has ordained that certain phenomena shall always occur in a certain order, and that philosophy without faith is powerless to discover God. Although chiefly famous in the West as a philosopher, he himself would probably have repudiated the title. He tells us that his object in studying philosophy was to confute the philosophers. His true element was not philosophy but religion, with which his whole being was penetrated, and which met all his spiritual needs. Even in his most heterogeneous studies he always kept before him one aim--the confirmation, spread, and glorification of Islam.