Plato, Letters 312a

ἐλθὼν εἰς Συρακούσας συμμάρτυρα λαβεῖν σέ, ἵνα μοι τιμῷτο φιλοσοφία καὶ παρὰ τῷ πλήθει. τοῦτο δʼ οὐκ εὐαγές μοι ἀπέβη. τὸ δʼ αἴτιον οὐ λέγω ὅπερ ἂν πολλοὶ εἴποιεν, ἀλλʼ ὅτι ἐφαίνου οὐ πάνυ ἐμοὶ πιστεύειν σύ, ἀλλʼ ἐμὲ μέν πως ἀποπέμψασθαι ἐθέλειν, ἑτέρους δὲ μεταπέμψασθαι, καὶ ζητεῖν τὸ πρᾶγμα τί τὸ ἐμόν ἐστιν, ἀπιστῶν, ὡς ἐμοὶ δοκεῖ· καὶ οἱ ἐπὶ τούτοις βοῶντες πολλοὶ ἦσαν, λέγοντες ὡς σὺ ἐμοῦ μὲν

in Syracuse, to gain your testimony as well, in order that I might get philosophy held in honor even by the multitude. In this, however, I was disappointed. But the reason I give for this is not that which is commonly given; rather it was because you showed that you did not fully trust me but wished rather to get rid of me somehow and invite others in my place; and owing, as I believe, to your distrust of me, you showed yourself inquisitive as to what my business was. Thereupon it was proclaimed aloud by many that you utterly despised me