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διφθέραι

Τὸ νικᾶν αὐτὸν αὑτὸν πασῶν νικῶν πρώτη τε καὶ ἀρίστη. Τὸ δὲ ἡττᾶσθαι αὐτὸν ὑφ' ἑαυτοῦ πάντων αἴσχιστόν τε ἅμα καὶ κάκιστον. → Τo conquer yourself is the first and best victory of all, while to be conquered by yourself is of all the most shameful as well as evil
Plato, Laws, 626e

English (Woodhouse)

διφθέραι = (see also: διφθέρα) dressed hides, dressed skins

⇢ Look up "διφθέραι" on Google | Wiktionary | LSJ full text search (Translation based on the reversal of Woodhouse's English to Ancient Greek dictionary)