Theognis, 117-118

“Nothing is harder than recognizing a counterfeit.
But, Kurnos, there is nothing more urgent than guarding against one.”

κιβδήλου δ᾿ ἀνδρὸς γνῶναι χαλεπώτερον οὐδέν,
Κύρν᾿, οὐδ᾿ εὐλαβίης ἐστὶ περὶ πλέονος.

119-128

“One can survive the ruin from counterfeit silver and gold
Kurnos—and a wise person can easily uncover it.
But if a dear friend’s mind is hidden in his chest
When he is false and he has a deceptive heart,
Well, this the most counterfeit thing god has made for mortals
And it is the most painful thing of all to recognize.

For you cannot know the mind of a man or a woman
Before you investigate them, like an animal under a yoke—
And you cannot imagine what they are like at the right time
Since appearances often mislead your judgement.”

Χρυσοῦ κιβδήλοιο καὶ ἀργύρου ἀνσχετὸς ἄτη,
Κύρνε, καὶ ἐξευρεῖν ῥάιδιον ἀνδρὶ σοφῶι.
εἰ δὲ φίλου νόος ἀνδρὸς ἐνὶ στήθεσσι λελήθηι
ψυδρὸς ἐών, δόλιον δ’ ἐν φρεσὶν ἦτορ ἔχηι,
τοῦτο θεὸς κιβδηλότατον ποίησε βροτοῖσιν,
καὶ γνῶναι πάντων τοῦτ’ ἀνιηρότατον.
οὐδὲ γὰρ εἰδείης ἀνδρὸς νόον οὐδὲ γυναικός,
πρὶν πειρηθείης ὥσπερ ὑποζυγίου,
οὐδέ κεν εἰκάσσαις ὥσπερ ποτ’ ἐς ὥριον ἐλθών·
πολλάκι γὰρ γνώμην ἐξαπατῶσ’ ἰδέαι.