Thus the love of self, the moving principle of every individual, becomes the necessary foundation of every association; and on the observance of that law of our nature has depended the fate of nations. Have the factitious and conventional laws tended to that object and accomplished that aim? Every one, urged by a powerful instinct, has displayed all the faculties of his being; and the sum of individual felicities has constituted the general felicity. Have these laws, on the contrary, restrained the effort of man toward his own happiness? His heart, deprived of its exciting principle, has languished in inactivity, and from the oppression of individuals has resulted the weakness of the state. As self-love, impetuous and improvident, is ever urging man against his equal, and consequently tends to dissolve society, the art of legislation and the merit of administrators consists in attempering the conflict of individual cupidities, in maintaining an equilibrium of powers, and securing to every one his happiness, in order that, in the shock of society against society, all the members may have a common interest in the preservation and defence of the public welfare. The internal splendor and prosperity of empires then, have had for their efficient cause the equity of their laws and government; and their respective external powers have been in proportion to the number of persons interested, and their degree of interest in the public welfare. On the other hand, the multiplication of men, by complicating their relations, having rendered the precise limitation of their rights difficult, the perpetual play of the passions having produced incidents not foreseen--their conventions having been vicious, inadequate, or nugatory--in fine, the authors of the laws having sometimes mistaken, sometimes disguised their objects; and their ministers, instead of restraining the cupidity of others, having given themselves up to their own; all these causes have introduced disorder and trouble into societies; and the viciousness of laws and the injustice of governments, flowing from cupidity and ignorance, have become the causes of the misfortunes of nations, and the subversion of states. CHAPTER X. GENERAL CAUSES OF THE PROSPERITY OF ANCIENT STATES.