Legatio Ad Gaium

Now the greatest and most excellent of all sciences is the science of government, by means of which every country which is good and fertile, whether it be champaign or mountainous, is cultivated, and every sea is navigated without danger by heavily-laden merchant-vessels, to communicate to the different countries the useful productions of each, out of a natural desire for participation and association, so that each land receives what it stands in need of, and sends abroad in requital those good things of which it has a superfluity;