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Rh far surpassed their Syrian teachers, developed important schools of philosophy, became the teachers of the Jews, and with the help of the latter introduced Greek philosophy as well as their own development thereof into Christian Europe in the beginning of the thirteenth century.

We see now that the impulse to philosophizing came from the Greeks,—and not merely the impulse but the material, the matter as well as the method and the terminology. In the Aristotelian writings we find developed an entire system of thought. There is not a branch of knowledge dealing with fundamental principles which is not there represented. First of all Aristotle stands alone as the discoverer of the organon of thought, the tool which we all employ in our reasoning and reflection; he is the first formulator of the science and art of logic. He treats besides of the principles of nature and natural phenomena in the Physics and the treatise on the Heavens. He discusses the nature of the soul, the senses and the intellect in his "Psychology." In the "History of Animals" and other minor works we have a treatment of biology. In the Nikomachean and Eudemian Ethics he analyzes the meaning of virtue, gives a list and classification of the virtues and discusses the summum bonum or the aim of human life. Finally in the Metaphysics we have an analysis of the fundamental notions of being, of the nature of reality and of God.

The Jews did not get all this in its purity for various reasons. In the first place it was only gradually that the Jews became acquainted with the wealth of Aristotelian material. We are sure that Abraham Ibn Daud, the forerunner of Maimonides, had a thorough familiarity with the ideas of Aristotle; and those who came after him, for example Maimonides, Gersonides, Hasdai Crescas, show clearly that they were deep students of the ideas represented in the writings of the Stagirite. But there is not the same evidence in the earlier writings of Isaac Israeli, Saadia, Joseph Ibn Zaddik, Gabirol, Bahya Ibn Pakuda, Judah Halevi. They had picked up Aristotelian ideas and principles, but they had also absorbed ideas and concepts from other schools, Greek as well as Arabian, and unconsciously combined the two.

Another explanation for the rarity of the complete and unadulterated Aristotle among the Jewish thinkers of the middle ages is that people in those days were very uncritical in the matter of historical