Depopulation.

When a country is prosperous the population tends to increase. In the Roman Empire, even as early as Augustus, a falling off in numbers was apparent, which was bound to sap the vitality of the state. War, plague, the evil results of slavery, and the outrageous taxation all combined to hasten the depopulation; for when it is hard to make a living, men are deterred from marrying and find it difficult to bring up large families.

Infiltration of Germans into the Empire.

In order to replenish the population great numbers of the Germans were encouraged to settle within the Empire, where they became coloni. Constantine is said to have called in three hundred thousand of a single people. Barbarians were enlisted in the Roman legions to keep out their fellow-Germans. Julius Cæsar was the first to give them a place among his soldiers. The expedient became more and more common, until, finally, whole armies were German, entire tribes being enlisted under their own chiefs. Some of the Germans rose to be distinguished generals; others attained important positions among the officials of the government. In this way it came about that a great many of the inhabitants of the Roman Empire were Germans before the great invasions. The line dividing the Roman and the barbarian was growing indistinct. It is not unreasonable to suppose that the influx of barbarians smoothed the way for the break-up of the western part of the Empire. Although they had a great respect for the Roman state, they must have kept some of their German love of individual liberty and could have had little sympathy for the despotism under which they lived.

Decline of literature and art.

6. As the Empire declined in strength and prosperity and was gradually permeated by the barbarians, its art and literature fell far below the standard of the great writers and artists of the golden age of Augustus. The sculpture of Constantine's time was far inferior to that of Trajan's. Cicero's exquisitely finished style lost its charm for the readers of the fourth and fifth centuries, and a florid, inferior species of oratory took its place. Tacitus, who died about A.D. 120, is perhaps the latest of the Latin authors whose works may be ranked among the classics. No more great men of letters arose. Few of those who understand and enjoy Latin literature to-day would think of reading any of the poetry or prose written after the beginning of the second century.

Reliance upon mere compendiums.

During the three hundred years before the invasions those who read at all did not ordinarily take the trouble to study the classics, but relied upon mere collections of quotations; and for what they called science, upon compendiums and manuals. These the Middle Ages inherited, and it was not until the time of Petrarch, in the fourteenth century, that Europe once more reached a degree of cultivation which enabled the more discriminating scholars to appreciate the best productions of the great authors of antiquity, both Greek and Latin.[2]

Preparation for Christianity.

In spite of the general decline of which we have been speaking, the Roman world appeared to be making progress in one important respect. During the first and second centuries a sort of moral revival took place and a growing religious enthusiasm showed itself, which prepared the way for the astonishingly rapid introduction of the new Christian religion. Some of the pagan philosophers had quite given up the old idea which we find in Homer and Virgil, that there were many gods, and had reached an elevated conception of the one God and of our duty toward Him. "Our duty," writes the philosopher Epictetus at the end of the first century, "is to follow God, ... to be of one mind with Him, to devote ourselves to the performance of His commands." The emperor Marcus Aurelius (d. 180) expresses similar sentiments in his Meditations,[3] the notes which he wrote for his own guidance. There was a growing abhorrence for the notorious vices of the great cities, and an ever-increasing demand for pure and upright conduct. The pagan religions taught that the souls of the dead continued to exist in Hades; but the life to come was believed to be a dreary existence at best.