Maimonides. And this leads us to consider the second point mentioned above, the nature and content of what was attributed in the middle ages to the credit of reason. It was in reality once more a set of documents. The Bible and Talmud were the documents of revelation, Aristotle was the document of reason. Each was supreme in its sphere, and all efforts must be bent to make them agree, for as revelation cannot be doubted, so neither can the assured results of reason. But not all which pretends to be the conclusion of reason is necessarily so in truth, as on the other hand the documents of faith are subject to interpretation and may mean something other than appears on the surface. That the Bible has an esoteric meaning besides the literal has its source in the Talmud itself. Reference is found there to a mystic doctrine of creation known as "Maase Bereshit" and a doctrine of the divine chariot called "Maase Merkaba."[2] The exact nature of these teachings is not known since the Talmud itself prohibits the imparting of this mystic lore to any but the initiated, i. e., to those showing themselves worthy; and never to more than one or two at a time.[3] But it is clear from the names of these doctrines that they centered about the creation story in Genesis and the account of the divine chariot in Ezekiel, chapters one and ten. Besides the Halaka and Agada are full of interpretations of Biblical texts which are very far from the literal and have little to do with the context. Moreover, the beliefs current among the Jews in Alexandria in the first century B.C. found their way into mediæval Jewry, that the philosophic literature of the Greeks was originally borrowed or stolen from the Hebrews, who lost it in times of storm and stress.[4] This being the case, it was believed that the Bible itself cannot be without some allusions to philosophic doctrines. That the Bible does not clearly teach philosophy is due to the fact that it was intended for the salvation of all men, the simple as well as the wise, women and children as well as male adults. For these it is sufficient that they know certain religious truths within their grasp and conduct themselves according to the laws of goodness and righteousness. A strictly philosophic book would have been beyond their ken and they would have been left without a guide in life. But the more intellectual and the more ambitious are not merely permitted, nay they are obligated to search the Scriptures for the deeper truths found therein, truths akin to the philosophic doctrines found in Greek literature; and the latter will help them in understanding the Bible aright. It thus became a duty to study philosophy and the sciences preparatory thereto, logic, mathematics and physics; and thus equipped to approach the Scriptures and interpret them in a philosophical manner. The study of mediæval Jewish rationalism has therefore two sides to it, the analysis of metaphysical, ethical and psychological problems, and