ἐπιδείκνυσθαι

From LSJ

εἰ πλείονα δ' εἰδείης Σισύφου → if you were more intelligent than Sisyphus

Source

Greek > English (Woodhouse Verbs Reversed)

(see also ἐπιδείκνυμι): display, show, give proof of, make an exhibition of oneself, exhibit