In this day and age, this might instead be a text message or a tweet to someone in a position of authority. But this letter is from Libanius to Julian the Apostate, Roman Emperor and our personal (anti-?)hero:
“Even if you don’t send me letters, I still dine on your words. For whenever someone else gets one, we hear about it and immediately read it, either by persuading or overpowering the unwilling recipient. So, my profit is no less than theirs even though it is only their right to be honored. I would also ask for honor, for some love-token from you. For, clearly, if you would honor me in any way, you wouldn’t do it without love.”
Ἀλλ᾿ εἰ καὶ μὴ πρὸς ἡμᾶς ἐπιστέλλεις, ἡμεῖς γε τοῖς σοῖς ἑστιώμεθα γράμμασιν. ὅταν γὰρ ὅτι τις ἔλαβε μάθωμεν, εὐθὺς ἡμεῖς πλησίον καὶ ἢ πείσαντες ἢ κρατήσαντες ἀκόντων ἀνέγνωμεν.τὸ μὲν οὖν κέρδος οὐχ ἧττον ἡμῶν ἢ ᾿κείνων, τὸ τετιμῆσθαι δὲ παρ᾿ ἐκείνοις μόνοις. ἐρῶμεν δὲ καὶ αὐτοὶ τιμῆς, ἐπειδὴ καὶ φίλτρου τοῦ παρὰ σοί. δῆλον γὰρ ὡς, εἴ τι τιμήσεις, οὐκ ἄνευ γε τοῦ φιλεῖν τοῦτο ποιήσεις.