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.
The tourist more rarely visits Constantinople or studies the architecture of Sancta Sofia, but when he does, he is distinctly conscious of forces not quite the same. Justinian has not the simplicity of Charlemagne. The Eastern Empire showed an activity and variety of forces that classical Europe had never possessed. The navy of Nicephoras Phocas in the tenth century would have annihilated in half an hour any navy that Carthage or Athens or Rome ever set afloat. The dynamic scheme began by asserting rather recklessly that between the Pyramids (B.C. 3000), and the Cross (A.D. 300), no new force affected Western progress, and antiquarians may easily dispute the fact; but in any case the motive influence, old or new, which raised both Pyramids and Cross was the same attraction of power in a future life that raised the dome of Sancta Sofia and the Cathedral at Amiens, however much it was altered, enlarged, or removed to distance in space. Therefore, no single event has more puzzled historians than the sudden, unexplained appearance of at least two new natural forces of the highest educational value in mechanics, for the first time within record of history. Literally, these two forces seemed to drop from the sky at the precise moment when the Cross on one side and the Crescent on the other, proclaimed the complete triumph of the Civitas Dei. Had the Manichean doctrine of Good and Evil as rival deities been orthodox, it would alone have accounted for this simultaneous victory of hostile powers.
Of the compass, as a step towards demonstration of the dynamic law, one may confidently say that it proved, better than any other force, the widening scope of the mind, since it widened immensely the range of contact between nature and thought. The compass educated. This must prove itself as needing no proof.
Of Greek fire and gunpowder, the same thing cannot certainly be said, for they have the air of accidents due to the attraction of religious motives. They belong to the spiritual world; or to the doubtful ground of Magic which lay between Good and Evil. They were chemical forces, mostly explosives, which acted and still act as the most violent educators ever known to man, but they were justly feared as diabolic, and whatever insolence man may have risked towards the milder teachers of his infancy, he was an abject pupil towards explosives. The Sieur de Joinville left a record of the energy with which the relatively harmless Greek fire educated and enlarged the French mind in a single night in the year 1249, when the crusaders were trying to advance on Cairo. The good king St. Louis and all his staff dropped on their knees at every fiery flame that flew by, praying — "God have pity on us!" and never had man more reason to call on his gods than they, for the battle of religion between Christian and Saracen was trifling compared with that of education between gunpowder and the Cross.