The Wealth of Nations by Part 5 Chapter 1 Page 118

The disorders in the government of Indostan have been supposed to render a like precaution necessary even among that mild and gentle people; and it was under pretence of securing their persons and property from violence that both the English and French East India Companies were allowed to erect the first forts which they possessed in that country. Among other nations, whose vigorous government will suffer no strangers to possess any fortified place within their territory, it may be necessary to maintain some ambassador, minister, or counsel, who may both decide, according to their own customs, the differences arising among his own countrymen, and, in their disputes with the natives, may, by means of his public character, interfere with more authority, and afford them a more powerful protection, than they could expect from any private man.