But industry, knowledge, and humanity are not advantageous in private life alone; they diffuse their beneficial influence on the public, and render the government as great and flourishing as they make individuals happy and prosperous. The increase and consumption of all the commodities which serve to the ornament and pleasure of life are advantageous to society, because at the same time that they multiply those innocent gratifications to individuals, they are a kind of storehouse of labour, which, in the exigencies of state, may be turned to the public service. In a nation where there is no demand for such superfluities men sink into indolence, lose all the enjoyment of life, and are useless to the public, which cannot maintain nor support its fleets and armies from the industries of such slothful members. The bounds of all the European kingdoms are at present pretty near the same they were two hundred years ago; but what a difference is there in the power and grandeur of those kingdoms! Which can be ascribed to nothing but the increase of art and industry. When Charles VIII. of France invaded Italy, he carried with him about 20,000 men; and yet this armament so exhausted the nation, as we learn from Guicciardin, that for some years it was not able to make so great an effort. The late King of France, in time of war, kept in pay above 400,000 men,​[10] though from Mazarin’s death to his own he was engaged in a course of wars that lasted near thirty years. This industry is much promoted by the knowledge inseparable from the ages of art and refinement; as, on the other hand, this knowledge enables the public to make the best advantage of the industry of its subjects. Laws, order, police, discipline—these can never be carried to any degree of perfection before human reason has refined itself by exercise, and by an application to the more vulgar arts, at least, of commerce and manufactures. Can we expect that a government will be well modelled by a people who know not how to make a spinning-wheel, or to employ a loom to advantage? Not to mention that all ignorant ages are infested with superstition, which throws the government off its bias, and disturbs men in the pursuit of their interest and happiness.