In discussing the life and death of Critias (relative of Plato, one of the Thirty Tyrants of Athens), Philostratus writes.
“I claim that no man can die nobly if he does so for the wrong beliefs. This seems to me to be the reason that [Critias’] wisdom and thoughts are less well esteemed by the Greeks. For, if our words are not in accord with our character, we seem to speak with a foreign tongue, like flutes.”
ἐμοὶ δὲ ἀποπεφάνθω μηδένα ἀνθρώπων καλῶς δὴ ἀποθανεῖν ὑπὲρ ὧν οὐκ ὀρθῶς εἵλετο, δι’ ἅ μοι δοκεῖ καὶ ἡ σοφία τοῦ ἀνδρὸς καὶ τὰ φροντίσματα ἧττον σπουδασθῆναι τοῖς ῞Ελλησιν• εἰ γὰρ μὴ ὁμολογήσει ὁ λόγος τῷ ἤθει, ἀλλοτρίᾳ τῇ γλώττῃ δόξομεν φθέγγεσθαι, ὥσπερ οἱ αὐλοί.