be in one's element

From LSJ

σοφόν γάρ ἕν βούλευμα τάς πολλάς χεῖρας νικᾶ, σὺν ὄχλῳ δ' ἀμαθία μεῖζον κακό → better than many hands is one wise thought, a multitude of fools makes folly worse

Source

English > Greek (Woodhouse Extra)

εὐπαθεῖν, εὐφραίνεσθαι