The Wealth of Nations by Part 5 Chapter 1 Page 260

difficulties which are continually occurring. Invention is kept alive, and the mind is not suffered to fall into that drowsy stupidity which, in a civilised society, seems to benumb the understanding of almost all the inferior ranks of people. In those barbarous societies, as they are called, every man, it has already been observed, is a warrior. Every man, too, is in some measure a statesman, and can form a tolerable judgment concerning the interest of the society and the conduct of those who govern it.

How far their chiefs are good judges in peace, or good leaders in war, is obvious to the observation of almost every single man among them. In such a society, indeed, no man can well acquire that improved and refined understanding which a few men sometimes possess in a more civilised state. Though in a rude society there