[2] Certus, unwavering, as an arrow going straight to its mark is called “certa sagitta.” So Henry, rightly, reconciling Serv. and Wagn. Neither love nor stormy water deterred Aeneas from his purpose: he looked back to Carthage, but he went sailing on. ‘Atros’ with ‘aquilone.’ Taubm. refers to Gell. 2. 30, “Austris spirantibus mare fieri glaucum et caeruleum, Aquilonibus obscurius atriusque.” Aeneas encounters the danger Dido threatened (4. 310), and we see the consequence in the next paragraph.