When, at the end of a year, Luther came out of his retirement, he found that the world had changed. The seed that he had scattered was coming up with variations. His own Saxon neighbours, led by Carlstadt, were disposed to ride favourite opinions to death, with the exaggeration and exclusiveness of enthusiasts. In Switzerland, Zwingli held doctrines differing widely from his own, with a republican and aggressive spirit that was hateful to him. The Anabaptists started from his impulse, but in their earnest striving after holiness adopted principles which involved a distinct reaction towards medieval religion, and carried the multitude away. Near the Swiss frontier, Zurich encouraged an agitation among the country people, that was fomented by Lutheran and Anabaptist teachers, and broke out soon after into anticipations of 1789. Luther turned from the foe beyond the mountains to the foe within the gates, and employed himself thenceforward in repressing misconceptions of his system to men who were in some sense his disciples. Against Rome the tide was manifestly rising. The danger was on his own side. This is variously called the reversal of original principle, the great surrender, the breach between Reformation and Revolution. Luther was acquiring caution and restraint. The creative period of the Reformation was over. All the ideas by which he so deeply moved the world had been produced in the first five years. Beyond the elementary notions that govern life, he lost interest in the further pursuit of theology. "Abraham," he said, "had faith; therefore Abraham was a good Christian." What else there might be in Christianity mattered less; and nearly all metaphysical inquiry, even on the Trinity, was neglected by the German reformers.