Plato, Letters 312c

ὑπὸ σοῦ τιμήσω σέ, μὴ τιμώμενος δὲ ἡσυχίαν ἕξω. ἔτι δὲ σὺ μὲν ἐμὲ τιμῶν καὶ τούτου καθηγούμενος φιλοσοφίαν δόξεις τιμᾶν, καὶ αὐτὸ τοῦτο, ὅτι διεσκόπεις καὶ ἄλλους, πρὸς πολλῶν εὐδοξίαν σοι οἴσει ὡς φιλοσόφῳ ὄντι. ἐγὼ δὲ σὲ τιμῶν μὴ τιμῶντα πλοῦτον δόξω θαυμάζειν τε καὶ διώκειν, τοῦτο δʼ ἴσμεν ὅτι παρὰ πᾶσιν ὄνομα οὐ καλὸν ἔχει· ὡς δʼ ἐν κεφαλαίῳ εἰπεῖν, σοῦ μὲν τιμῶντος ἀμφοτέροις κόσμος,

by you, I will honor you; but if I am not honored I will keep to myself. Moreover, if you honor me and take the lead in so doing, you will be thought to be honoring philosophy; and the very fact that you have studied other systems as well will gain you the credit, in the eyes of many, of being a philosopher yourself. But if I honor you, while you do not honor me, I shall be deemed to be a man who worships and pursues after wealth; and to such conduct everyone, we know, gives a bad name. So, to sum it all up, if you pay the honor, it will be a credit to both of us, but if I pay it a disgrace to both.