The man who has received a benefit ought always to remember it, but he who has granted it ought to forget the fact at once. — Demosthenes. Classical Athenian statesman and orator (384–322 BC)
He who confers a favor should at once forget it, if he is not to show a sordid ungenerous spirit. To remind a man of a kindness conferred and to talk of it, is little different from reproach.
You cannot have a proud and chivalrous spirit if your conduct is mean and paltry; for whatever a man's actions are, such must be his spirit.