Ὅμηρον ἐξ Ὁμήρου σαφηνίζειν → explain Homer from Homer, explain Homer with Homer
antĕ-curro: ĕre, v. n.,I to run before: stella solem antecurrens, Vitr. 9, 4.
antĕcurrō, ĕre, tr., précéder dans sa course : Vitr. Arch. 9, 1, 7.