Ezra was the first who seriously took in hand the problem of the future of Israel after the great convulsion of the Exile. For nearly a century after the time, 536 B.C., when liberty to return had been given, the small band of Jews in and around Jerusalem had maintained with difficulty their place as a nation and the religion of their fathers. Subjects of the Persian king, like their neighbours, they were exposed to dangers, both political and religious, against which they were ill able to guard. They had the Temple as the central point of their religion; but the Temple was no protection against the influence of contact with "the peoples round about," nor did the performance of its ritual give any lead in the direction of a new religious development. Till Ezra came, the Jews did hardly more than mark time, if indeed they were not gradually losing ground. If Ezra had not come, it is conceivable, and indeed highly probable, that Judaism would have disappeared altogether. The significance of the work of Ezra is this, that he stopped the process by which the religious vitality of Israel was draining away, and he gave a lead, opened a new line of development, turned the thought and energy of his people into a direction where progress was possible almost without end. His reformation was carried out with a severity which would have been impossible unless he had had the support of Nehemiah, armed as governor with the authority of the Persian king. And the success he achieved was only won in the face of bitter opposition, and at a cost of domestic suffering and heart-burning which still makes one shudder as one reads of it in the book which bears his name. It was a case in which "diseases desperate grown, by desperate appliance are relieved." Ezra had it clear in his mind that if Israel was to survive at all, it must resolutely cut itself off from all possible contact with what was not Israel. It must become a closed corporation, a community occupying not merely a political but much more a religious and social enclosure of its own, within which it could work out its own salvation. In the catastrophe of the Exile, Ezra read the lesson that indiscriminate association with neighbouring peoples had corrupted its religious life, and brought upon a faithless nation a deserved punishment. If now Israel let itself relapse into the old way of intercourse and alliance with non-Israelites, the result would be the final extinction of Israel. Such a prospect might have been tolerable if there had been nothing left for Israel to do. Some of those who opposed Ezra may well have thought that there was nothing which could demand so hard a sacrifice as that which he would force upon them. Why should they not live in peace with their neighbours, and do as they did? And why could they not keep their old religion, without making it a source of enmity abroad, and a cause of grief at home?