Such are the sensible causes of all the miseries, into which opulence at length plunges the most celebrated nations. In proportion as arts and industry flourish, the despised husbandman, burdened with the taxes necessary for the support of luxury, and condemned to pass his days between labour and hunger, forsakes his native field, to seek in towns the bread he ought to carry thither. The more our capital cities strike the vulgar eye with admiration, the greater reason is there to lament the sight of the abandoned countryside, the large tracts of land that lie uncultivated, the roads crowded with unfortunate citizens turned beggars or highwaymen, and doomed to end their wretched lives either on a dunghill or on the gallows. Thus the State grows rich on the one hand, and feeble and depopulated on the other; the mightiest monarchies, after having taken immense pains to enrich and depopulate themselves, fall at last a prey to some poor nation, which has yielded to the fatal temptation of invading them, and then, growing opulent and weak in its turn, is itself invaded and ruined by some other. Let any one inform us what produced the swarms of barbarians, who overran Europe, Asia and Africa for so many ages. Was their prodigious increase due to their industry and arts, to the wisdom of their laws, or to the excellence of their political system? Let the learned tell us why, instead of multiplying to such a degree, these fierce and brutal men, without sense or science, without education, without restraint, did not destroy each other hourly in quarrelling over the productions of their fields and woods. Let them tell us how these wretches could have the presumption to oppose such clever people as we were, so well trained in military discipline, and possessed of such excellent laws and institutions: and why, since society has been brought to perfection in northern countries, and so much pains taken to instruct their inhabitants in their social duties and in the art of living happily and peaceably together, we see them no longer produce such numberless hosts as they used once to send forth to be the plague and terror of other nations. I fear some one may at last answer me by saying, that all these fine things, arts, sciences and laws, were wisely invented by men, as a salutary plague, to prevent the too great multiplication of mankind, lest the world, which was given us for a habitation, should in time be too small for its inhabitants.