But if this way of measuring happiness, when applied to private men, be ruinous and false, it is so no less when applied to nations. Wealth, commerce, extent of territory, and the knowledge of arts, are, when properly employed, the means of preservation, and the foundations of power. If they fail in part, the nation is weakened; if they were entirely withheld, the race would perish: Their tendency is to maintain numbers of men, but not to constitute happiness. They will accordingly maintain the wretched as well as the happy. They answer one purpose, but are not therefore sufficient for all; and are of little significance, when only employed to maintain a timid, dejected, and servile people. Great and powerful states are able to overcome and subdue the weak; polished and commercial nations have more wealth, and practise a greater variety of arts, than the rude: but the happiness of men, in all cases alike, consists in the blessings of a candid, an active, and strenuous mind. And if we consider the state of society merely as that into which mankind are led by their propensities, as a state to be valued from its effect in preserving the species, in ripening their talents, and exciting their virtues, we need not enlarge our communities, in order to enjoy these advantages. We frequently obtain them in the most remarkable degree, where nations remain independent, and are of a small extent. To increase the numbers of mankind, may be admitted as a great and important object; but to extend the limits of any particular state, is not, perhaps, the way to obtain it: while we desire that our fellow creatures should multiply, it does not follow, that the whole should, if possible, be united under one head. We are apt to admire the empire of the Romans, as a model of national greatness and splendour; but the greatness we admire, in this case, was ruinous to the virtue and the happiness of mankind; it was found to be inconsistent with all the advantages which that conquering people had formerly enjoyed in the articles of government and manners. The emulation of nations proceeds from their division. A cluster of states, like a company of men, find the exercise of their reason, and the test of their virtues, in the affairs they transact, upon a foot of equality, and of separate interest. The measures taken for safety, including great part of the national policy, are relative in every state to what is apprehended from abroad. Athens was necessary to Sparta in the exercise of her virtue, as steel is to flint in the production of fire; and if the cities of Greece had been united under one head, we should never have heard of Epaminondas or Thrasybulus, of Lycurgus or Solon.