Moral Letters to Lucilius Section 21

Quattuor ait esse artium Posidonius genera: sunt volgares et sordidae, sunt ludicrae, sunt pueriles, sunt liberales. Volgares opificum, quae manu constant et ad instruendam vitam occupatae sunt, in quibus nulla decoris, nulla honesti simulatio est.

Posidonius partage les arts en quatre classes :

Posidonius divides the arts into four classes: first we have those which are common and low, then those which serve for amusement, then those which refer to the education of boys, and, finally, the liberal arts. The common sort belong to workmen and are mere hand-work; they are concerned with equipping life; there is in them no pretence to beauty or honour.