After recovering from a severe illness, he determined to write a commentary on the Pentateuch, a self-appointed task from which he shrank on account of its great difficulty. He was now in the sixty-fourth year of his age (1152-1153). But there are no signs of old age to be found in the work, which bears the stamp of freshness and youthful vigor. The exposition of the Pentateuch by Ibn-Ezra is an artistic piece of work, both in contents and in form. The language is vigorous, flowing and witty, the interpretation profound, temperate, and bearing the impress of devoted work. His rich store of knowledge, his extensive reading and experience enabled him to make the Book of books more intelligible, and to scatter the misty clouds in which ignorance and prejudice had enshrouded it. In his introduction he describes in a very striking and clever manner the four customary and unsuitable methods of interpretation which he desires to avoid. Confident of success, he puts himself above his predecessors, and completes the task which he had set himself, to fix the natural meaning of the text. Ibn-Ezra, by means of his commentary to the Pentateuch, became the leader of the school of temperate, careful, and scientific expositors of the Bible, and held the first place among the few enlightened minds opposed to the obscurity of Agadic explanation, of which Rashi was the leading exponent. For although he denounced as heretical every interpretation that differed from the Massora, yet rationalists considered him their leading authority, and even unbelief looked to him for support. In fact, Ibn-Ezra gives us abundant reason for reckoning him among such men as Chivi Albalchi, Yitzchaki, and others, who called the authority of the Pentateuch into question. In a vague and mysterious way, he suggested that several verses in the Torah had been added by a later hand, and that whole passages belonged to a later period. It is difficult to know whether he was in earnest in his scepticism or in his firm belief. In Lucca, Ibn-Ezra wrote his brilliant commentary on Isaiah (1154-1155), and other less important works. After the completion of his commentary on the Pentateuch (1155), Ibn-Ezra left Italy, and went to the south of France, which, on account of its connection with Catalonia, possessed more of the Spanish-Jewish culture than the north of France, Italy, or Germany. In Jewish history Provence forms the dividing line between two methods, the strictly Talmudical, and the scientific and artistic. The Jewish Provençals worked actively according to both methods, but did not attain any degree of excellence in either, merely remaining admirers and imitators. Ibn-Ezra introduced a new element into this circle. In the town of Rhodez he lived several years (1155-1157), and wrote his commentaries to the book of Daniel, the Psalms, and the Twelve Prophets. His fame became wide-spread, and attracted admirers. The greatest rabbinical authority of the time, Jacob Tam, sent him a