Now, though it is impossible to put the characteristics of a whole century into such terse and powerful language as this, it cannot be doubted that each century, or considerable period, has its prevailing Thought,--a thought which it works out in almost all the ramifications of its course; which it receives from its predecessor in a totally different shape, and passes on to its successor in a still more altered form. Else why do we find the faith of one generation the ridicule and laughing-stock of the next? How did knighthood rise into the heroic regions of chivalry, and then sink in a succeeding period into the domain of burlesque? How did aristocracy in one age concentrate into kingship in another? And in a third, how did the golden ring of sovereignty lose its controlling power, and republics take their rise? How did the reverence of Europe settle at one time on the sword of Edward the Third, and at another on the periwig of Louis the Fourteenth? These and similar inquiries will lead us to the real principles and motive forces of a particular age, as they distinguished it from other ages. We shall label the centuries, as it were, with their characteristic marks, and know where to look for thoughts and incidents of a particular class and type. Let us look at the first century. Throughout the civilized world there is nothing but Rome. Under whatever form of government--under consuls, or triumvirs, or dictators--that wonderful city was mistress of the globe. Her internal dissensions had not weakened her power. While her streets were running with the blood of her citizens, her eagles were flying triumphant in Farther Asia and on the Rhine. Her old constitution had finally died off almost without a blow, and unconsciously the people, still talking of Cato and Brutus, became accustomed to the yoke. For seven-and-twenty years they had seen all the power of the state concentrated in one man; but the names of the offices of which their ancestors had been so proud were retained; and when Octavius, the nephew of the conqueror Julius Cæsar, placed himself above the law, it was only by uniting in his own person all the authority which the law had created. He was consul, tribune, prætor, pontifex, imperator,--whatever denomination conferred dignity and power; and by the legal exercise of all these trusts he had no rival and no check. He was finally presented by the senate with the lofty title of Augustus, which henceforth had a mysterious significance as the seal of imperial greatness, and his commands were obeyed without a murmur from the Tigris to the Tyne. But whilst in the enjoyment of this pre-eminence, the Roman emperor was unconscious that in a village of Judea, in the lowest rank of life, among the most contemned tribe of his dominions, his Master was born. [A.D. 1.] By this event the whole current of the world's history was changed. The great became small and the small great. Rome itself ceased to be the capital of the world,