The Wealth of Nations by Part 4 Chapter 7 Page 213

Europe may grow weaker, and the inhabitants of all the different quarters of the world may arrive at that equality of courage and force which, by inspiring mutual fear, can alone overawe the injustice of independent nations into some sort of respect for the rights of one another. But nothing seems more likely to establish this equality of force than that mutual communication of knowledge and of all sorts of improvements which an extensive commerce from all countries to all countries naturally, or rather necessarily, carries along with it.

In the meantime one of the principal effects of those discoveries has been to raise the mercantile system to a degree of splendour and glory which it could never otherwise have attained to. It is the object of that system to enrich a great nation rather by trade and manufactures than by