Evelyn Shirley Shuckburgh, Augustus. The life and times of the founder of the Roman Empire… (1903)
“ The former of these projects was no doubt important for the safety of the Empire, and was in after years successfully secured by Augustus and his legates. The latter was more visionary and theatrical, meant perhaps to strike the imagination of the Romans rather than to secure great practical advantage. After Cæsar's death Antony lost more than he gained by similar enterprises, and Augustus always avoided coming into actual contact with the Parthians, or attempting to extend his rule beyond the Euphrates. But there were dangers within the Empire no less formidable than from without. ”
