The common notion is that this period of Israel's history was practically a vacuum, and that through five centuries the nation experienced no further development. In reality, it was an exceedingly active period, characterized by most important developments. Politically it was a period of constantly changing influences. Israel was scarcely ever really independent during these centuries. Her changes were the changes from one master to another. But this very subjection aided her intellectual development, as she was thus brought under the direct action of foreign ideas. Her rapid growth of population forced upon her a system of emigration, that drew off her youth to the great centres of the world and established large colonies in every leading city. Israel was never left to settle down again into provincialism, but was stirred by the currents of the great world of thought that poured in upon her from Greece and Egypt, from Rome and the far East. "A cross-fertilization of ideas" was thus carried on by Providence. The result of grafting the richest varieties of thought upon such a sturdy stock could not fail of proving something rare and rich. As was natural from such conditions, the thought of the nation took on new forms. Calm study of nature and man, and rational speculation on the great problems of life displaced impassioned and imaginative thought. Prophecy gave way to philosophy. The sages became the teachers of men. The third class of books in the Old Testament Canon, known by the Jews as the Writings, belong to this period; Proverbs, Ecclesiastes, Esther, Jonah, Daniel, etc. To this period also belongs the Apocrypha, which contains some noble books. These varied writings show, when critically studied, a direct bearing on the problems that we know were occupying the mind of the nation during this period, and illustrate the tendencies working among the people. We thus see, plainly, the growth of the seeds of noble thought which were sown in the national consciousness during the exile, and the growth of the rich germs wafted into Judea from Greece and Egypt. We can trace the development of the circle of ideas which, later on, crystallized, under the ethical and spiritual force of Jesus into the theology of Christianity. We watch the embryonic stages of this thought-body, which at length awaited only the breathing within it of an informing spirit to issue in a new and noble religion.