The period of the captivity in Babylon, which is commonly regarded as a period of sadness and desolation, a blank space of interruption in the nation's life, was, in reality, a period of intense mental activity; probably the highest spiritual moment in the history of the people. Dispossessed of their own territory, relieved of the burden and freed from the distraction of politics, their disintegrating tribal feuds terminated by foreign conquest, living, as unoppressed exiles, in one of the world's greatest cities, with opportunities for observation and reflection never enjoyed before, having unbroken leisure in the midst of material and intellectual opulence, the true children of Israel devoted themselves to the task of rebuilding spiritually the state that had been politically overthrown. The writings that reflect this period, particularly the later portions of Isaiah, exhibit the soul of the nation in proud resistance against the unbelief, the disloyalty, the worldliness, that were demoralizing the less noble part of their countrymen. The duty was laid on them to support the national character, revive the national faith, restore the national courage, and rebuild the national purpose. To this end they collected the traditions of past glory, gathered up the fragments of legend and song, reanimated the souls of their heroes and saints, developed ideas that existed only in germ, arranged narratives and legislation, and constructed an ideal state. There is reason to believe that the real genius of the people was first called into full exercise, and put on its career of development at this time; that Babylon was a forcing nursery, not a prison cell; creating instead of stifling a nation. The astonishing outburst of intellectual and moral energy that accompanied the return from the Babylonish captivity attests the spiritual activity of that "mysterious and momentous" time. When the hour of deliverance struck, the company of defeated, disheartened, crushed, to all seeming, "reckless, lawless, godless" exiles came forth "transformed into a band of puritans." The books that remain from those generations, Daniel, the Maccabees, Esdras, are charged with an impetuous eloquence and a frenzied zeal.