But [the Arabs'] friendship was venal, their faith inconstant, their enmity capricious: it was an easier task to excite than to disarm these roving barbarians; and, in the familiar intercourse of war, they learned to see, and to despise, the splendid weakness both of Rome and of Persia.

A philosopher may deplore the eternal discords of the human race, but he will confess, that the desire of spoil is a more rational provocation than the vanity of conquest.

Books are those faithful mirrors that reflect to our mind the minds of sages and heroes.

Agriculture is the foundation of manufactures; since the productions of nature are the materials of art. Under the Roman empire, the labour of an industrious and ingenious people was variously, but incessantly employed, in the service of the rich. In their dress, their table, their houses, and their furniture, the favourites of fortune united every refinement of conveniency, of elegance, and of splendour, whatever could soothe their pride or gratify their sensuality.

But this inestimable privilege was soon violated: with the knowledge of truth the emperor imbibed the maxims of persecution; and the sects which dissented from the catholic church were afflicted and oppressed by the triumph of Christianity. Constantine easily believed that the heretics, who presumed to dispute his opinions or to oppose his commands, were guilty of the most absurd and criminal obstinacy; and that a seasonable application of moderate severities might save those unhappy men from the danger of an everlasting condemnation.

The decline of Rome was the natural and inevitable effect of immoderate greatness. Prosperity ripened the principle of decay; the cause of the destruction multiplied with the extent of conquest; and, as soon as time or accident and removed the artificial supports, the stupendous fabric yielded to the pressure of its own weight. The story of the ruin is simple and obvious: and instead of inquiring why the Roman Empire was destroyed we should rather be surprised that it has subsisted for so long.

The nations, and the sects, of the Roman world, admitted with equal credulity, and similar abhorrence, the reality of that infernal art [witchcraft], which was able to control the eternal order of the planets, and the voluntary operations of the human mind. . . . They believed, with the wildest inconsistency, that this preternatural dominion of the air, of earth, and of hell, was exercised, from the vilest motives of malice or gain, by some wrinkled hags and itinerant sorcerers, who passed their obscure lives in penury and contempt.