The torpor was broken by two great revolutions, the one moral, the other political, the one from within, the other from without. The victory of Christianity over Paganism, considered with relation to this subject only, was of great importance. It overthrew the old system of morals; and with it much of the old system of metaphysics. It furnished the orator with new topics of declamation, and the logician with new points of controversy. Above all, it introduced a new principle, of which the operation was constantly felt in every part of society. It stirred the stagnant mass from the inmost depths. It excited all the passions of a stormy democracy in the quiet and listless population of an overgrown empire. The fear of heresy did what the sense of oppression could not do; it changed men, accustomed to be turned over like sheep from tyrant to tyrant, into devoted partisans and obstinate rebels. The tones of an eloquence which had been silent for ages resounded from the pulpit of Gregory. A spirit which had been extinguished on the plains of Philippi revived in Athanasius and Ambrose. Yet even this remedy was not sufficiently violent for the disease. It did not prevent the empire of Constantinople from relapsing, after a short paroxysm of excitement, into a state of stupefaction, to which history furnishes scarcely any parallel. We there find that a polished society, a society in which a most intricate and elaborate system of jurisprudence was established, in which the arts of luxury were well understood, in which the works of the great ancient writers were preserved and studied, existed for nearly a thousand years without making one great discovery in science, or producing one book which is read by any but curious inquirers. There were tumults, too, and controversies, and wars in abundance: and these things, bad as they are in themselves, have generally been favourable to the progress of the intellect. But here they tormented without stimulating. The waters were troubled; but no healing influence descended. The agitations resembled the grinnings and writhings of a galvanised corpse, not the struggles of an athletic man. From this miserable state the Western Empire was saved by the fiercest and most destroying visitation with which God has ever chastened his creatures--the invasion of the Northern nations. Such a cure was required for such a distemper. The fire of London, it has been observed was a blessing. It burned down the city; but it burned out the plague. The same may be said of the tremendous devastation of the Roman dominions. It annihilated the noisome recesses in which lurked the seeds of great moral maladies; it cleared an atmosphere fatal to the health and vigour of the human mind. It cost Europe a thousand years of barbarism to escape the fate of China.