Plutarch on guilds as lump diminishers

But of all his measures the most commended was his distribution of the people by their trades into companies or guilds; for as the city consisted, or rather did not consist of, but was divided into, two different tribes, the diversity between which could not be effaced and in the mean time prevented all unity and caused perpetual tumult and ill-blood, reflecting how hard substances that do not readily mix when in the lump may, by being beaten into powder, in that minute form be combined, he resolved to divide the whole population into a number of small divisions, and thus hoped, by introducing other distinctions, to obliterate the original and great distinction, which would be lost among the smaller. So, distinguishing the whole people by the several arts and trades, he formed the companies of musicians, goldsmiths, carpenters, dyers, shoemakers, skinners, braziers, and potters; and all other handicraftsmen he composed and reduced into a single company, appointing every one their proper courts, councils, and religious observances. In this manner all factious distinctions began, for the first time, to pass out of use, no person any longer being either thought of or spoken of under the notion of a Sabine or a Roman, a Romulian or a Tatian; and the new division became a source of general harmony and intermixture. Life of Numa Pompilius