"But yours have not acquired that art aright"

(Canto 10, line 51)

This seems to be a jab at the fact that Farinata's Uberti clan remained banished from Florence - after the Guelfs regained power in 1267, they did banish many Ghibellines, but in order to appease the masses then published great amnesties, which allowed most Ghibellines to return to the city. The Ubertis were however not included in these amnesties.