Book II 2:35:05  Book III 4:10:00

On Duties (Latin: DE OFFICIIS) discusses virtue, expediency and apparent conflicts between the two. St. Ambrose, St. Jerome and other Doctors of the Roman Catholic Church considered it to be legitimate for study. Anthony Grafton says that it was the second book after the Bible printed on Gutenberg's press.  It was a standard text taught at Eton College. Translated by Walter Miller. Painting: Phryne Revealed Before the Areopagus by Jean-Léon Gérôme.