There the Western world stood till the year A.D. 305, when the Emperor Diocletian abdicated; and there it was that Adams broke down on the steps of Ara Cœli, his path blocked by the scandalous failure of civilization at the moment it had achieved complete success. In the year 305 the empire had solved the problems of Europe more completely than they have ever been solved since. The Pax Romana, the Civil Law, and Free Trade should, in four hundred years, have put Europe far in advance of the point reached by modern society in the four hundred years since 1500, when conditions were less simple.
The efforts to explain, or explain away, this scandal had been incessant, but none suited Adams unless it were the economic theory of adverse exchanges and exhaustion of minerals; but nations are not ruined beyond a certain point by adverse exchanges, and Rome had by no means exhausted her resources. On the contrary, the empire developed resources and energies quite astounding. No other four hundred years of history before A.D. 1800 knew anything like it; and although some of these developments, like the Civil Law, the roads, aqueducts, and harbors, were rather economies than force, yet in northwestern Europe alone the empire had developed three energies--France, England, and Germany--competent to master the world. The trouble seemed rather to be that the empire developed too much energy, and too fast.
A dynamic law requires that two masses--nature and man--must go on, reacting upon each other, without stop, as the sun and a comet react on each other, and that any appearance of stoppage is illusive. The theory seems to exact excess, rather than deficiency, of action and reaction to account for the dissolution of the Roman Empire, which should, as a problem of mechanics, have been torn to pieces by acceleration. If the student means to try the experiment of framing a dynamic law, he must assign values to the forces of attraction that caused the trouble; and in this case he has them in plain evidence. With the relentless logic that stamped Roman thought, the empire, which had established unity on earth, could not help establishing unity in heaven. It was induced by its dynamic necessities to economize the gods.
The Church has never ceased to protest against the charge that Christianity ruined the empire, and, with its usual force, has pointed out that its reforms alone saved the State. Any dynamic theory gladly admits it. All it asks is to find and follow the force that attracts. The Church points out this force in the Cross, and history needs only to follow it. The empire loudly asserted its motive. Good taste forbids saying that Constantine the Great speculated as audaciously as a modern stock-broker on values of which he knew at the utmost only the volume; or that he merged all uncertain forces into a single trust, which he enormously overcapitalized, and forced on the market; but this is the substance of what Constantine himself said in his Edict of Milan in the year 313, which admitted Christianity into the Trust of State Religions. Regarded as an Act of Congress, it runs: "We have resolved to grant to Christians as well as all others the liberty to practice the religion they prefer, in order that whatever exists of divinity or celestial power may help and favor us and all who are under our government." The empire pursued power--not merely spiritual but physical--in the sense in which Constantine issued his army order the year before, at the battle of the Milvian Bridge: In hoc signo vinces! using the Cross as a train of artillery, which, to his mind, it was. Society accepted it in the same character. Eighty years afterwards, Theodosius marched against his rival Eugene with the Cross for physical champion; and Eugene raised the image of Hercules to fight for the pagans; while society on both sides looked on, as though it were a boxing-match, to decide a final test of force between the divine powers. The Church was powerless to raise the ideal. What is now known as religion affected the mind of old society but little. The laity, the people, the million, almost to a man, bet on the gods as they bet on a horse.
No doubt the Church did all it could to purify the process, but society was almost wholly pagan in its point of view, and was drawn to the Cross because, in its system of physics, the Cross had absorbed all the old occult or fetish-power. The symbol represented the sum of nature--the Energy of modern science--and society believed it to be as real as X-rays; perhaps it was! The emperors used it like gunpowder in politics; the physicians used it like rays in medicine; the dying clung to it as the quintessence of force, to protect them from the forces of evil on their road to the next life.
Throughout these four centuries the empire knew that religion disturbed economy, for even the cost of heathen incense affected the exchanges; but no one could afford to buy or construct a costly and complicated machine when he could hire an occult force at trifling expense. Fetish-power was cheap and satisfactory, down to a certain point. Turgot and Auguste Comte long ago fixed this stage of economy as a necessary phase of social education, and historians seem now to accept it as the only gain yet made towards scientific history. Great numbers of educated people--perhaps a majority--cling to the method still, and practice it more or less strictly; but, until quite recently, no other was known. The only occult power at man's disposal was fetish. Against it, no mechanical force could compete except within narrow limits.
Outside of occult or fetish-power, the Roman world was incredibly poor. It knew but one productive energy resembling a modern machine--the slave. No artificial force of serious value was applied to production or transportation, and when society developed itself so rapidly in political and social lines, it had no other means of keeping its economy on the same level than to extend its slave-system and its fetish-system to the utmost.
The result might have been stated in a mathematical formula as early as the time of Archimedes, six hundred years before Rome fell. The economic needs of a violently centralizing society forced the empire to enlarge its slave-system until the slave-system consumed itself and the empire too, leaving society no resource but further enlargement of its religious system in order to compensate for the losses and horrors of the failure. For a vicious circle, its mathematical completeness approached perfection. The dynamic law of attraction and reaction needed only a Newton to fix it in algebraic form.
At last, in 410, Alaric sacked Rome, and the slave-ridden, agricultural, uncommercial Western Empire--the poorer and less Christianized half--went to pieces. Society, though terribly shocked by the horrors of Alaric's storm, felt still more deeply the disappointment in its new power, the Cross, which had failed to protect its Church. The outcry against the Cross became so loud among Christians that its literary champion, Bishop Augustine of Hippo--a town between Algiers and Tunis--was led to write a famous treatise in defence of the Cross, familiar still to every scholar, in which he defended feebly the mechanical value of the symbol--arguing only that pagan symbols equally failed--but insisted on its spiritual value in the Civitas Dei which had taken the place of the Civitas Romae in human interest. "Granted that we have lost all we had! Have we lost faith? Have we lost piety? Have we lost the wealth of the inner man who is rich before God? These are the wealth of Christians!" The Civitas Dei, in its turn, became the sum of attraction for the Western world, though it also showed the same weakness in mechanics that had wrecked the Civitas Romae. St. Augustine and his people perished at Hippo towards 430, leaving society in appearance dull to new attraction.
Yet the attraction remained constant. The delight of experimenting on occult force of every kind is such as to absorb all the free thought of the human race. The gods did their work; history has no quarrel with them; they led, educated, enlarged the mind; taught knowledge; betrayed ignorance; stimulated effort. So little is known about the mind--whether social, racial, sexual or heritable; whether material or spiritual; whether animal, vegetable or mineral--that history is inclined to avoid it altogether; but nothing forbids one to admit, for convenience, that it may assimilate food like the body, storing new force and growing, like a forest, with the storage. The brain has not yet revealed its mysterious mechanism of gray matter. Never has Nature offered it so violent a stimulant as when she opened to it the possibility of sharing infinite power in eternal life, and it might well need a thousand years of prolonged and intense experiment to prove the value of the motive. During these so-called Middle Ages, the Western mind reacted in many forms, on many sides, expressing its motives in modes, such as Romanesque and Gothic architecture, glass windows and mosaic walls, sculpture and poetry, war and love, which still affect some people as the noblest work of man, so that, even to-day, great masses of idle and ignorant tourists travel from far countries to look at Ravenna and San Marco, Palermo and Pisa, Assisi, Cordova, Chartres, with vague notions about the force that created them, but with a certain surprise that a social mind of such singular energy and unity should still lurk in their shadows.