The ancient Greek schools were, properly speaking, only two, and in determining the conception of the summum bonum these followed in fact one and the same method, inasmuch as they did not allow virtue and happiness to be regarded as two distinct elements of the summum bonum, and consequently sought the unity of the principle by the rule of identity;
Antzinako eskola grekoen artean benetan bi besterik ez ziren ongi gorenaren adigaiaren determinazioan metodo berbera jarraitzen zutenak, bertutea eta zoriona ongi gorenaren bi osagai ezberdin bihurtu gabe, eta beraz, printzipioaren batasuna bilatuz identitatearen erregelaren arabera, baina honetan ezberdintzen ziren, hots, bien artean oinarrizko adigai ezberdina aukeratu zutela.