Plutarch, Life of Sulla 30 5.10
“It is understandable that he brought a prejudice on the highest offices in the land, which would no longer allow people to return the characters they started with, but instead could make them mean, boastful, and inhumane. Whether this is a movement or a change of nature because of chance or it is an unmasking of the truth when there is evil in authority, some other investigation will discover.”
εἰκότως προσετρίψατο ταῖς μεγάλαις ἐξουσίαις διαβολὴν ὡς τὰ ἤθη μένειν οὐκ ἐώσαις ἐπὶ τῶν ἐξ ἀρχῆς τρόπων, ἀλλ’ ἔμπληκτα καὶ χαῦνα καὶ ἀπάνθρωπα ποιούσαις. τοῦτο μὲν οὖν εἴτε κίνησίς ἐστι καὶ μεταβολὴ φύσεως ὑπὸ τύχης, εἴτε μᾶλλον ὑποκειμένης ἀποκάλυψις ἐν ἐξουσίᾳ κακίας, ἑτέρα τις ἂν διορίσειε πραγματεία.
ἀποκαλύπτειν, [anakaluptein] “to unveil, uncover,” perhaps, “unmask”; “to disclose or uncover one’s mind”
ἀποκάλυψις, ἡ [apokalupsis]: “a revelation, disclosure, making known of a fault”, perhaps “unmasking”