Demosthenes, On the Crown 268-9
“This was my behavior in my actions for the city. In private matters, if any of you do not know that I have been generous and kind and solicitous of those in need, I am silent and I say nothing and present no witness of these things, not the war prisoners I have ransomed, nor the money I have provided for daughters, nor anything like that at all.
This is a rule I live by. I believe that the person who receives a favor should remember it for the rest of time but that the person who does it should forget it immediately for the former to act rightly and the latter not to play the part of a cheap-minded person. To remind someone of a favor you have provided in private and to speak so cheaply is just like reproaching them. I will not do anything like this but however I am considered about these things will be enough for me.”
Ἐν μὲν τοίνυν τοῖς πρὸς τὴν πόλιν τοιοῦτος· ἐν δὲ τοῖς ἰδίοις εἰ μὴ πάντες ἴσθ᾿ ὅτι κοινὸς καὶ φιλάνθρωπος καὶ τοῖς δεομένοις ἐπαρκῶν, σιωπῶ καὶ οὐδὲν ἂν εἴποιμ᾿ οὐδὲ παρασχοίμην περὶ τούτων οὐδεμίαν μαρτυρίαν, οὔτ᾿ εἴ τινας ἐκ τῶν πολεμίων ἐλυσάμην, οὔτ᾿ εἴ τισιν θυγατέρας συνεξέδωκα, οὔτε τῶν τοιούτων οὐδέν. καὶ γὰρ οὕτω πως ὑπείληφα ἐγὼ νομίζω τὸν μὲν εὖ παθόντα δεῖν μεμνῆσθαι πάντα τὸν χρόνον, τὸν δὲ ποιήσαντ᾿ εὐθὺς ἐπιλελῆσθαι, εἰ δεῖ τὸν μὲν χρηστοῦ, τὸν δὲ μὴ μικροψύχου ποιεῖν ἔργον ἀνθρώπου. τὸ δὲ τὰς ἰδίας εὐεργεσίας ὑπομιμνῄσκειν καὶ λέγειν μικροῦ δεῖν ὅμοιόν ἐστιν τῷ ὀνειδίζειν. οὐ δὴ ποιήσω τοιοῦτον οὐδέν, οὐδὲ προαχθήσομαι, ἀλλ᾿ ὅπως ποθ᾿ ὑπείλημμαι περὶ τούτων, ἀρκεῖ μοι.