ἥδε ἡ ἡμέρα τοῖς Ἕλλησι μεγάλων κακῶν ἄρξει
From LSJ
νᾶφε καὶ μέμνασο ἀπιστεῖν → keep a clear head and remember not to believe a thing (Epicharmus fr. 250)
English > Greek (Woodhouse Quotes Reversed)
this day will be the beginning of sore trouble for the Greeks